Method and device for allocating resources by limiting RU and MRU for STA operating only in 20MHz band in WLAN system

ABSTRACT

Proposed herein is a method and device for setting limited RUs and MRUs in a WLAN system. More specifically, a receiving STA receives a PPDU from a transmitting STA through a preset frequency band, and decodes the PPDU. The receiving STA is an STA operating only in a 20 MHz band. The PPDU includes a preamble and a data field. The data field is received through resources other than the first RU and the first MRU among the preset frequency band.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.17/446,267, filed on Aug. 27, 2021, which claims the benefit of earlierfiling date and right of priority to Korean Patent Application Nos.10-2020-0112516, filed on Sep. 3, 2020 and 10-2020-0114041, filed onSep. 7, 2020, the contents of which are all hereby incorporated byreference herein in their entirety.

TECHNICAL FIELD

The present specification relates to a method for performing allocationby limiting resources in a WLAN system and, most particularly, to amethod and device for allocating resources by limiting RU and MRU for astation (STA) operating only in a 20 MHz band in a WLAN system.

BACKGROUND

A wireless local area network (WLAN) has been improved in various ways.For example, the IEEE 802.11ax standard proposed an improvedcommunication environment using orthogonal frequency division multipleaccess (OFDMA) and downlink multi-user multiple input multiple output(DL MU MIMO) techniques.

The present specification proposes a technical feature that can beutilized in a new communication standard. For example, the newcommunication standard may be an extreme high throughput (EHT) standardwhich is currently being discussed. The EHT standard may use anincreased bandwidth, an enhanced PHY layer protocol data unit (PPDU)structure, an enhanced sequence, a hybrid automatic repeat request(HARQ) scheme, or the like, which is newly proposed. The EHT standardmay be called the IEEE 802.11be standard.

In the new wireless LAN standard, an increased number of spatial streamsmay be used. In this case, in order to properly use the increased numberof spatial streams, a signaling technique in the WLAN system may need tobe improved.

SUMMARY OF THE DISCLOSURE

The present specification proposes a method and device for allocatingresources by limiting RU and MRU for an STA operating only in a 20 MHzband in a wireless local area network (WLAN) system.

An example of the present specification proposes a method for allocatingresources by limiting RU and MRU for an STA operating only in a 20 MHzband.

The present embodiment may be performed in a network environment inwhich a next generation WLAN system is being supported. The nextgeneration wireless LAN system is a WLAN system that is enhanced from an802.11ax system and may, therefore, satisfy backward compatibility withthe 802.11ax system.

The present embodiment may be performed by a receiving station (STA),and the receiving STA may correspond to a non-AP STA operating only in a20 MHz band. A transmitting STA may correspond to an access point (AP)STA.

The present embodiment proposes a method for configuring RU and MRU thatcannot be allocated (that are limited (or restricted) for allocation) toan STA operating only in a 20 MHz band based on an 80 MHz band toneplan, which is newly defined in an 802.11 be WLAN system.

A receiving station (STA) receives a Physical Protocol Data Unit (PPDU)from a transmitting STA through a preset frequency band.

The receiving STA decodes the PPDU.

The receiving STA is an STA that operates only in a 20 MHz band.

The PPDU includes a preamble and a data field. And, the data field isreceived through resources other than a first resource unit (RU) and afirst multiple RUs (MRU) among the preset frequency band. The first MRUis newly defined in the 802.11be wireless LAN system as multiple RUshaving 2 RUs aggregated therein.

When the preset frequency band is a 40 MHz band, an RU layout (or toneplan) for the 40 MHz band is as described below. The tone plan for the40 MHz band is the same in both 802.11ax and 802.11be WLAN systems.

When the 40 MHz band consists of only 26 tone RUs, the 40 MHz bandincludes first to 18th 26 tone RUs. When the 40 MHz band consists ofonly 52 tone RUs, the 40 MHz band includes first to 8th 52 tone RUs.When the 40 MHz band consists of only 106 tone RUs, the 40 MHz bandincludes first to 4th 106 tone RUs. And, when the 40 MHz band consistsonly of 242 tone RUs, the 40 MHz band includes first and second 242 toneRUs.

At this point, the first to 18th 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency. The first to 8th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency. The first to 4th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency. And, the first and second 242 tone RUsmay be arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU includes the 5th and 14th 26 tone RUs and the first andsecond 242 tone RUs. That is, the 5th and 14th 26 tone RUs and the firstand second 242 tone RUs correspond to resources that are not allocatedto the receiving STA.

The first MRU includes an MRU in which the 5th 26 tone RU and the second52 tone RU are aggregated, an MRU in which the 14th 26 tone RU and the6th 52 tone RU are aggregated, an MRU in which the 5th 26 tone RU andthe first 106 tone RU are aggregated, an MRU in which the 5th 26 tone RUand the second 106 tone RU are aggregated, an MRU in which the 14th 26tone RU and the 3rd 106 tone RU are aggregated, and an MRU in which the14th 26 tone RU and the 4th 106 tone RU are aggregated. That is, themultiple RUs included in the first MRU also correspond to resources thatare not allocated to the receiving STA.

The present embodiment proposes a method according to which thereceiving STA is allocated only to remaining units (RUs) excluding thefirst RU and the first MRU, when the receiving STA receives an OFDMAPPDU through a 40 MHz band.

ADVANTAGEOUS EFFECTS

According to the embodiment proposed in this specification, the presentdisclosure may have a new effect of being capable of preventingperformance degradation and interference of an adjacent channel fromoccurring by preventing data from being loaded on tones corresponding toDC tones and guard tones in a 20 MHz band, where the receiving STA canbe operated. Thus, the present disclosure may also have an effect ofincreasing the overall throughput of an STA operating only in a 20 MHzband.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 illustrates an example of a transmitting device and/or areceiving device according to the present disclosure.

FIG. 2 is a conceptual diagram illustrating the structure of a wirelesslocal area network (WLAN).

FIG. 3 illustrates a general link setup process.

FIG. 4 illustrates an example of a PPDU used in an IEEE standard.

FIG. 5 is a diagram illustrating a layout of resource units (RUs) usedin a band of 20 MHz.

FIG. 6 is a diagram illustrating a layout of resource units (RUs) usedin a band of 40 MHz.

FIG. 7 is a diagram illustrating a layout of resource units (RUs) usedin a band of 80 MHz.

FIG. 8 illustrates the structure of an HE-SIG-B field.

FIG. 9 illustrates an example in which a plurality of user STAs isallocated to the same RU through a MU-MIMO technique.

FIG. 10 illustrates an example of a PPDU used in the present disclosure.

FIG. 11 illustrates modified examples of a transmitting device and/orreceiving device of the present specification.

FIG. 12 illustrates atone plan for an 80 MHz PPDU in an 802.11be WLANsystem.

FIG. 13 illustrates an example of RU that cannot be allocated to a 20MHz only or operating STA in a 40 MHz PPDU transmission.

FIG. 14 illustrates examples of 26+52 tone MRUs and 26+106 tone MRUsthat are used in a 20 MHz EHT PPDU OFDMA transmission.

FIG. 15 illustrates examples of 26+52 tone MRUs and 26+106 tone MRUsthat are used in a 40 MHz EHT PPDU OFDMA transmission.

FIG. 16 illustrates examples of 26+52 tone MRUs that are used in an 80MHz EHT PPDU OFDMA transmission.

FIG. 17 illustrates examples of 26+106 tone MRUs that are used in an 80MHz EHT PPDU OFDMA transmission.

FIG. 18 is a procedure flowchart showing operations of a transmittingdevice according to the present embodiment.

FIG. 19 is a procedure flowchart showing operations of a receivingdevice according to the present embodiment.

FIG. 20 is a flowchart showing a procedure of performing allocation, bythe AP, by limiting RUs or MRUs for an STA operating only in a 20 MHzband according to the present embodiment.

FIG. 21 is a flowchart showing a procedure of receiving allocation, byan STA operating only in a 20 MHz band, by limiting RUs or MRUsaccording to the present embodiment.

DETAILED DESCRIPTION

In the present specification, “A or B” may mean “only A”, “only B” or“both A and B”. In other words, in the present specification, “A or B”may be interpreted as “A and/or B”. For example, in the presentspecification, “A, B, or C” may mean “only A”, “only B”, “only C”, or“any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean“and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B”may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C”may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “onlyA”, “only B”, or “both A and B”. In addition, in the presentspecification, the expression “at least one of A or B” or “at least oneof A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A, B, and C”may mean “only A”, “only B”, “only C”, or “any combination of A, B, andC”. In addition, “at least one of A, B, or C” or “at least one of A, B,and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean“for example”. Specifically, when indicated as “control information(EHT-signal)”, it may mean that “EHT-signal” is proposed as an exampleof the “control information”. In other words, the “control information”of the present specification is not limited to “EHT-signal”, and“EHT-signal” may be proposed as an example of the “control information”.In addition, when indicated as “control information (i.e., EHT-signal)”,it may also mean that “EHT-signal” is proposed as an example of the“control information”.

Technical features described individually in one figure in the presentspecification may be individually implemented, or may be simultaneouslyimplemented.

The following example of the present specification may be applied tovarious wireless communication systems. For example, the followingexample of the present specification may be applied to a wireless localarea network (WLAN) system. For example, the present specification maybe applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11axstandard. In addition, the present specification may also be applied tothe newly proposed EHT standard or IEEE 802.11be standard. In addition,the example of the present specification may also be applied to a newWLAN standard enhanced from the EHT standard or the IEEE 802.11bestandard. In addition, the example of the present specification may beapplied to a mobile communication system. For example, it may be appliedto a mobile communication system based on long term evolution (LTE)depending on a 3^(rd) generation partnership project (3GPP) standard andbased on evolution of the LTE. In addition, the example of the presentspecification may be applied to a communication system of a 5G NRstandard based on the 3GPP standard.

Hereinafter, in order to describe a technical feature of the presentspecification, a technical feature applicable to the presentspecification will be described.

FIG. 1 shows an example of a transmitting apparatus and/or receivingapparatus of the present specification.

In the example of FIG. 1 , various technical features described belowmay be performed.

FIG. 1 relates to at least one station (STA). For example, STAs 110 and120 of the present specification may also be called in various termssuch as a mobile terminal, a wireless device, a wirelesstransmit/receive unit (WTRU), a user equipment (UE), a mobile station(MS), a mobile subscriber unit, or simply a user. The STAs 110 and 120of the present specification may also be called in various terms such asa network, a base station, a node-B, an access point (AP), a repeater, arouter, a relay, or the like. The STAs 110 and 120 of the presentspecification may also be referred to as various names such as areceiving apparatus, a transmitting apparatus, a receiving STA, atransmitting STA, a receiving device, a transmitting device, or thelike.

For example, the STAs 110 and 120 may serve as an AP or a non-AP. Thatis, the STAs 110 and 120 of the present specification may serve as theAP and/or the non-AP. In the present specification, the AP may beindicated as an AP STA.

The STAs 110 and 120 of the present specification may support variouscommunication standards together in addition to the IEEE 802.11standard. For example, a communication standard (e.g., LTE, LTE-A, 5G NRstandard) or the like based on the 3GPP standard may be supported. Inaddition, the STA of the present specification may be implemented asvarious devices such as a mobile phone, a vehicle, a personal computer,or the like. In addition, the STA of the present specification maysupport communication for various communication services such as voicecalls, video calls, data communication, and self-driving(autonomous-driving), or the like.

The STAs 110 and 120 of the present specification may include a mediumaccess control (MAC) conforming to the IEEE 802.11 standard and aphysical layer interface for a radio medium.

The STAs 110 and 120 will be described below with reference to asub-figure (a) of FIG. 1 .

The first STA 110 may include a processor 111, a memory 112, and atransceiver 113. The illustrated process, memory, and transceiver may beimplemented individually as separate chips, or at least twoblocks/functions may be implemented through a single chip.

The transceiver 113 of the first STA performs a signaltransmission/reception operation. Specifically, an IEEE 802.11 packet(e.g., IEEE 802.11a/b/g/n/ac/ax/be, etc.) may be transmitted/received.

For example, the first STA 110 may perform an operation intended by anAP. For example, the processor 111 of the AP may receive a signalthrough the transceiver 113, process a reception (RX) signal, generate atransmission (TX) signal, and provide control for signal transmission.The memory 112 of the AP may store a signal (e.g., RX signal) receivedthrough the transceiver 113, and may store a signal (e.g., TX signal) tobe transmitted through the transceiver.

For example, the second STA 120 may perform an operation intended by anon-AP STA. For example, a transceiver 123 of a non-AP performs a signaltransmission/reception operation. Specifically, an IEEE 802.11 packet(e.g., IEEE 802.11a/b/g/n/ac/ax/be packet, etc.) may betransmitted/received.

For example, a processor 121 of the non-AP STA may receive a signalthrough the transceiver 123, process an RX signal, generate a TX signal,and provide control for signal transmission. A memory 122 of the non-APSTA may store a signal (e.g., RX signal) received through thetransceiver 123, and may store a signal (e.g., TX signal) to betransmitted through the transceiver.

For example, an operation of a device indicated as an AP in thespecification described below may be performed in the first STA 110 orthe second STA 120. For example, if the first STA 110 is the AP, theoperation of the device indicated as the AP may be controlled by theprocessor 111 of the first STA 110, and a related signal may betransmitted or received through the transceiver 113 controlled by theprocessor 111 of the first STA 110. In addition, control informationrelated to the operation of the AP or a TX/RX signal of the AP may bestored in the memory 112 of the first STA 110. In addition, if thesecond STA 120 is the AP, the operation of the device indicated as theAP may be controlled by the processor 121 of the second STA 120, and arelated signal may be transmitted or received through the transceiver123 controlled by the processor 121 of the second STA 120. In addition,control information related to the operation of the AP or a TX/RX signalof the AP may be stored in the memory 122 of the second STA 120.

For example, in the specification described below, an operation of adevice indicated as anon-AP (or user-STA) may be performed in the firstSTA 110 or the second STA 120. For example, if the second STA 120 is thenon-AP, the operation of the device indicated as the non-AP may becontrolled by the processor 121 of the second STA 120, and a relatedsignal may be transmitted or received through the transceiver 123controlled by the processor 121 of the second STA 120. In addition,control information related to the operation of the non-AP or a TX/RXsignal of the non-AP may be stored in the memory 122 of the second STA120. For example, if the first STA 110 is the non-AP, the operation ofthe device indicated as the non-AP may be controlled by the processor111 of the first STA 110, and a related signal may be transmitted orreceived through the transceiver 113 controlled by the processor 111 ofthe first STA 110. In addition, control information related to theoperation of the non-AP or a TX/RX signal of the non-AP may be stored inthe memory 112 of the first STA 110.

In the specification described below, a device called a(transmitting/receiving) STA, a first STA, a second STA, an STA1, anSTA2, an AP, a first AP, a second AP, an AP1, an AP2, a(transmitting/receiving) terminal, a (transmitting/receiving) device, a(transmitting/receiving) apparatus, a network, or the like may imply theSTAs 110 and 120 of FIG. 1 . For example, a device indicated as, withouta specific reference numeral, the (transmitting/receiving) STA, thefirst STA, the second STA, the STA1, the STA2, the AP, the first AP, thesecond AP, the AP1, the AP2, the (transmitting/receiving) terminal, the(transmitting/receiving) device, the (transmitting/receiving) apparatus,the network, or the like may imply the STAs 110 and 120 of FIG. 1 . Forexample, in the following example, an operation in which various STAstransmit/receive a signal (e.g., a PPDU) may be performed in thetransceivers 113 and 123 of FIG. 1 . In addition, in the followingexample, an operation in which various STAs generate a TX/RX signal orperform data processing and computation in advance for the TX/RX signalmay be performed in the processors 111 and 121 of FIG. 1 . For example,an example of an operation for generating the TX/RX signal or performingthe data processing and computation in advance may include: 1) anoperation ofdetermining/obtaining/configuring/computing/decoding/encoding bitinformation of a sub-field (SIG, STF, LTF, Data) included in a PPDU; 2)an operation of determining/configuring/obtaining a time resource orfrequency resource (e.g., a subcarrier resource) or the like used forthe sub-field (SIG, STF, LTF, Data) included the PPDU; 3) an operationof determining/configuring/obtaining a specific sequence (e.g., a pilotsequence, an STF/LTF sequence, an extra sequence applied to SIG) or thelike used for the sub-field (SIG, STF, LTF, Data) field included in thePPDU; 4) a power control operation and/or power saving operation appliedfor the STA; and 5) an operation related todetermining/obtaining/configuring/decoding/encoding or the like of anACK signal. In addition, in the following example, a variety ofinformation used by various STAs fordetermining/obtaining/configuring/computing/decoding/decoding a TX/RXsignal (e.g., information related to a field/subfield/controlfield/parameter/power or the like) may be stored in the memories 112 and122 of FIG. 1 .

The aforementioned device/STA of the sub-figure (a) of FIG. 1 may bemodified as shown in the sub-figure (b) of FIG. 1 . Hereinafter, theSTAs 110 and 120 of the present specification will be described based onthe sub-figure (b) of FIG. 1 .

For example, the transceivers 113 and 123 illustrated in the sub-figure(b) of FIG. 1 may perform the same function as the aforementionedtransceiver illustrated in the sub-figure (a) of FIG. 1 . For example,processing chips 114 and 124 illustrated in the sub-figure (b) of FIG. 1may include the processors 111 and 121 and the memories 112 and 122. Theprocessors 111 and 121 and memories 112 and 122 illustrated in thesub-figure (b) of FIG. 1 may perform the same function as theaforementioned processors 111 and 121 and memories 112 and 122illustrated in the sub-figure (a) of FIG. 1 .

A mobile terminal, a wireless device, a wireless transmit/receive unit(WTRU), a user equipment (UE), a mobile station (MS), a mobilesubscriber unit, a user, a user STA, a network, a base station, aNode-B, an access point (AP), a repeater, a router, a relay, a receivingunit, a transmitting unit, a receiving STA, a transmitting STA, areceiving device, a transmitting device, a receiving apparatus, and/or atransmitting apparatus, which are described below, may imply the STAs110 and 120 illustrated in the sub-figure (a)/(b) of FIG. 1 , or mayimply the processing chips 114 and 124 illustrated in the sub-figure (b)of FIG. 1 . That is, a technical feature of the present specificationmay be performed in the STAs 110 and 120 illustrated in the sub-figure(a)/(b) of FIG. 1 , or may be performed only in the processing chips 114and 124 illustrated in the sub-figure (b) of FIG. 1 . For example, atechnical feature in which the transmitting STA transmits a controlsignal may be understood as a technical feature in which a controlsignal generated in the processors 111 and 121 illustrated in thesub-figure (a)/(b) of FIG. 1 is transmitted through the transceivers 113and 123 illustrated in the sub-figure (a)/(b) of FIG. 1 . Alternatively,the technical feature in which the transmitting STA transmits thecontrol signal may be understood as a technical feature in which thecontrol signal to be transferred to the transceivers 113 and 123 isgenerated in the processing chips 114 and 124 illustrated in thesub-figure (b) of FIG. 1 .

For example, a technical feature in which the receiving STA receives thecontrol signal may be understood as a technical feature in which thecontrol signal is received by means of the transceivers 113 and 123illustrated in the sub-figure (a) of FIG. 1 . Alternatively, thetechnical feature in which the receiving STA receives the control signalmay be understood as the technical feature in which the control signalreceived in the transceivers 113 and 123 illustrated in the sub-figure(a) of FIG. 1 is obtained by the processors 111 and 121 illustrated inthe sub-figure (a) of FIG. 1 . Alternatively, the technical feature inwhich the receiving STA receives the control signal may be understood asthe technical feature in which the control signal received in thetransceivers 113 and 123 illustrated in the sub-figure (b) of FIG. 1 isobtained by the processing chips 114 and 124 illustrated in thesub-figure (b) of FIG. 1 .

Referring to the sub-figure (b) of FIG. 1 , software codes 115 and 125may be included in the memories 112 and 122. The software codes 115 and126 may include instructions for controlling an operation of theprocessors 111 and 121. The software codes 115 and 125 may be includedas various programming languages.

The processors 111 and 121 or processing chips 114 and 124 of FIG. 1 mayinclude an application-specific integrated circuit (ASIC), otherchipsets, a logic circuit and/or a data processing device. The processormay be an application processor (AP). For example, the processors 111and 121 or processing chips 114 and 124 of FIG. 1 may include at leastone of a digital signal processor (DSP), a central processing unit(CPU), a graphics processing unit (GPU), and a modulator and demodulator(modem). For example, the processors 111 and 121 or processing chips 114and 124 of FIG. 1 may be SNAPDRAGON™ series of processors made byQualcomm®, EXYNOS™ series of processors made by Samsung®, A series ofprocessors made by Apple®, HELIO™ series of processors made byMediaTek®, ATOM™ series of processors made by Intel® or processorsenhanced from these processors.

In the present specification, an uplink may imply a link forcommunication from a non-AP STA to an SP STA, and an uplinkPPDU/packet/signal or the like may be transmitted through the uplink. Inaddition, in the present specification, a downlink may imply a link forcommunication from the AP STA to the non-AP STA, and a downlinkPPDU/packet/signal or the like may be transmitted through the downlink.

FIG. 2 is a conceptual view illustrating the structure of a wirelesslocal area network (WLAN).

An upper part of FIG. 2 illustrates the structure of an infrastructurebasic service set (BSS) of institute of electrical and electronicengineers (IEEE) 802.11.

Referring the upper part of FIG. 2 , the wireless LAN system may includeone or more infrastructure BSSs 200 and 205 (hereinafter, referred to asBSS). The BSSs 200 and 205 as a set of an AP and an STA such as anaccess point (AP) 225 and a station (STA1) 200-1 which are successfullysynchronized to communicate with each other are not concepts indicatinga specific region. The BSS 205 may include one or more STAs 205-1 and205-2 which may be joined to one AP 230.

The BSS may include at least one STA, APs providing a distributionservice, and a distribution system (DS) 210 connecting multiple APs.

The distribution system 210 may implement an extended service set (ESS)240 extended by connecting the multiple BSSs 200 and 205. The ESS 240may be used as a term indicating one network configured by connectingone or more APs 225 or 230 through the distribution system 210. The APincluded in one ESS 240 may have the same service set identification(SSID).

A portal 220 may serve as a bridge which connects the wireless LANnetwork (IEEE 802.11) and another network (e.g., 802.X).

In the BSS illustrated in the upper part of FIG. 2 , a network betweenthe APs 225 and 230 and a network between the APs 225 and 230 and theSTAs 200-1, 205-1, and 205-2 may be implemented. However, the network isconfigured even between the STAs without the APs 225 and 230 to performcommunication. A network in which the communication is performed byconfiguring the network even between the STAs without the APs 225 and230 is defined as an Ad-Hoc network or an independent basic service set(IBSS).

A lower part of FIG. 2 illustrates a conceptual view illustrating theIBSS.

Referring to the lower part of FIG. 2 , the IBSS is a BSS that operatesin an Ad-Hoc mode. Since the IBSS does not include the access point(AP), a centralized management entity that performs a managementfunction at the center does not exist. That is, in the IBSS, STAs 250-1,250-2, 250-3, 255-4, and 255-5 are managed by a distributed manner. Inthe IBSS, all STAs 250-1, 250-2, 250-3, 255-4, and 255-5 may beconstituted by movable STAs and are not permitted to access the DS toconstitute a self-contained network.

FIG. 3 illustrates a general link setup process.

In S310, a STA may perform a network discovery operation. The networkdiscovery operation may include a scanning operation of the STA. Thatis, to access a network, the STA needs to discover a participatingnetwork. The STA needs to identify a compatible network beforeparticipating in a wireless network, and a process of identifying anetwork present in a particular area is referred to as scanning.Scanning methods include active scanning and passive scanning.

FIG. 3 illustrates a network discovery operation including an activescanning process. In active scanning, a STA performing scanningtransmits a probe request frame and waits for a response to the proberequest frame in order to identify which AP is present around whilemoving to channels. A responder transmits a probe response frame as aresponse to the probe request frame to the STA having transmitted theprobe request frame. Here, the responder may be a STA that transmits thelast beacon frame in a BSS of a channel being scanned. In the BSS, sincean AP transmits a beacon frame, the AP is the responder. In an IBSS,since STAs in the IBSS transmit a beacon frame in turns, the responderis not fixed. For example, when the STA transmits a probe request framevia channel 1 and receives a probe response frame via channel 1, the STAmay store BSS-related information included in the received proberesponse frame, may move to the next channel (e.g., channel 2), and mayperform scanning (e.g., transmits a probe request and receives a proberesponse via channel 2) by the same method.

Although not shown in FIG. 3 , scanning may be performed by a passivescanning method. In passive scanning, a STA performing scanning may waitfor a beacon frame while moving to channels. A beacon frame is one ofmanagement frames in IEEE 802.11 and is periodically transmitted toindicate the presence of a wireless network and to enable the STAperforming scanning to find the wireless network and to participate inthe wireless network. In a BSS, an AP serves to periodically transmit abeacon frame. In an IBSS, STAs in the IBSS transmit a beacon frame inturns. Upon receiving the beacon frame, the STA performing scanningstores information about a BSS included in the beacon frame and recordsbeacon frame information in each channel while moving to anotherchannel. The STA having received the beacon frame may store BSS-relatedinformation included in the received beacon frame, may move to the nextchannel, and may perform scanning in the next channel by the samemethod.

After discovering the network, the STA may perform an authenticationprocess in S320. The authentication process may be referred to as afirst authentication process to be clearly distinguished from thefollowing security setup operation in S340. The authentication processin S320 may include a process in which the STA transmits anauthentication request frame to the AP and the AP transmits anauthentication response frame to the STA in response. The authenticationframes used for an authentication request/response are managementframes.

The authentication frames may include information about anauthentication algorithm number, an authentication transaction sequencenumber, a status code, a challenge text, a robust security network(RSN), and a finite cyclic group.

The STA may transmit the authentication request frame to the AP. The APmay determine whether to allow the authentication of the STA based onthe information included in the received authentication request frame.The AP may provide the authentication processing result to the STA viathe authentication response frame.

When the STA is successfully authenticated, the STA may perform anassociation process in S330. The association process includes a processin which the STA transmits an association request frame to the AP andthe AP transmits an association response frame to the STA in response.The association request frame may include, for example, informationabout various capabilities, a beacon listen interval, a service setidentifier (SSID), a supported rate, a supported channel, RSN, amobility domain, a supported operating class, a traffic indication map(TIM) broadcast request, and an interworking service capability. Theassociation response frame may include, for example, information aboutvarious capabilities, a status code, an association ID (AID), asupported rate, an enhanced distributed channel access (EDCA) parameterset, a received channel power indicator (RCPI), a receivedsignal-to-noise indicator (RSNI), a mobility domain, a timeout interval(association comeback time), an overlapping BSS scanning parameter, aTIM broadcast response, and a QoS map.

In S340, the STA may perform a security setup process. The securitysetup process in S340 may include a process of setting up a private keythrough four-way handshaking, for example, through an extensibleauthentication protocol over LAN (EAPOL) frame.

FIG. 4 illustrates an example of a PPDU used in an IEEE standard.

As illustrated in FIG. 4 , various types of PHY protocol data units(PPDUs) are used in IEEE a/g/n/ac standards. Specifically, a LTF and aSTF include a training signal, a SIG-A and a SIG-B include controlinformation for a receiving STA, and a data field includes user datacorresponding to a PSDU (MAC PDU/aggregated MAC PDU).

FIG. 4 also includes an example of an HE PPDU according to IEEE802.11ax. The HE PPDU according to FIG. 4 is an illustrative PPDU formultiple users. An HE-SIG-B may be included only in a PPDU for multipleusers, and an HE-SIG-B may be omitted in a PPDU for a single user.

As illustrated in FIG. 4 , the HE-PPDU for multiple users (MUs) mayinclude a legacy-short training field (L-STF), a legacy-long trainingfield (L-LTF), a legacy-signal (L-SIG), a high efficiency-signal A(HE-SIG A), a high efficiency-signal-B (HE-SIG B), a highefficiency-short training field (HE-STF), a high efficiency-longtraining field (HE-LTF), a data field (alternatively, an MAC payload),and a packet extension (PE) field. The respective fields may betransmitted for illustrated time periods (i.e., 4 or 8 μs).

Hereinafter, a resource unit (RU) used for a PPDU is described. An RUmay include a plurality of subcarriers (or tones). An RU may be used totransmit a signal to a plurality of STAs according to OFDMA. Further, anRU may also be defined to transmit a signal to one STA. An RU may beused for an STF, an LTF, a data field, or the like.

FIG. 5 illustrates a layout of resource units (RUs) used in a band of 20MHz.

As illustrated in FIG. 5 , resource units (RUs) corresponding todifferent numbers of tones (i.e., subcarriers) may be used to form somefields of an HE-PPDU. For example, resources may be allocated inillustrated RUs for an HE-STF, an HE-LTF, and a data field.

As illustrated in the uppermost part of FIG. 5 , a 26-unit (i.e., a unitcorresponding to 26 tones) may be disposed. Six tones may be used for aguard band in the leftmost band of the 20 MHz band, and five tones maybe used for a guard band in the rightmost band of the 20 MHz band.Further, seven DC tones may be inserted in a center band, that is, a DCband, and a 26-unit corresponding to 13 tones on each of the left andright sides of the DC band may be disposed. A 26-unit, a 52-unit, and a106-unit may be allocated to other bands. Each unit may be allocated fora receiving STA, that is, a user.

The layout of the RUs in FIG. 5 may be used not only for multiple users(MUs) but also for a single user (SU), in which case one 242-unit may beused and three DC tones may be inserted as illustrated in the lowermostpart of FIG. 5 .

Although FIG. 5 proposes RUs having various sizes, that is, a 26-RU, a52-RU, a 106-RU, and a 242-RU, specific sizes of RUs may be extended orincreased. Therefore, the present embodiment is not limited to thespecific size of each RU (i.e., the number of corresponding tones).

FIG. 6 illustrates a layout of RUs used in a band of 40 MHz.

Similarly to FIG. 5 in which RUs having various sizes are used, a 26-RU,a 52-RU, a 106-RU, a 242-RU, a 484-RU, and the like may be used in anexample of FIG. 6 . Further, five DC tones may be inserted in a centerfrequency, 12 tones may be used for a guard band in the leftmost band ofthe 40 MHz band, and 11 tones may be used for a guard band in therightmost band of the 40 MHz band.

As illustrated in FIG. 6 , when the layout of the RUs is used for asingle user, a 484-RU may be used. The specific number of RUs may bechanged similarly to FIG. 5 .

FIG. 7 illustrates a layout of RUs used in a band of 80 MHz.

Similarly to FIG. 5 and FIG. 6 in which RUs having various sizes areused, a 26-RU, a 52-RU, a 106-RU, a 242-RU, a 484-RU, a 996-RU, and thelike may be used in an example of FIG. 7 . Further, seven DC tones maybe inserted in the center frequency, 12 tones may be used for a guardband in the leftmost band of the 80 MHz band, and 11 tones may be usedfor a guard band in the rightmost band of the 80 MHz band. In addition,a 26-RU corresponding to 13 tones on each of the left and right sides ofthe DC band may be used.

As illustrated in FIG. 7 , when the layout of the RUs is used for asingle user, a 996-RU may be used, in which case five DC tones may beinserted.

In the meantime, the fact that the specific number of RUs can be changedis the same as those of FIGS. 5 and 6 .

The RU arrangement (i.e., RU location) shown in FIGS. 5 to 7 can beapplied to a new wireless LAN system (e.g., EHT system) as it is.Meanwhile, for the 160 MHz band supported by the new WLAN system, the RUarrangement for 80 MHz (i.e., an example of FIG. 7 ) may be repeatedtwice, or the RU arrangement for the 40 MHz (i.e., an example of FIG. 6) may be repeated 4 times. In addition, when the EHT PPDU is configuredfor the 320 MHz band, the arrangement of the RU for 80 MHz (i.e., anexample of FIG. 7 ) may be repeated 4 times or the arrangement of the RUfor 40 MHz (i.e., an example of FIG. 6 ) may be repeated 8 times.

One RU of the present specification may be allocated for a single STA(e.g., a single non-AP STA). Alternatively, a plurality of RUs may beallocated for one STA (e.g., a non-AP STA).

The RU described in the present specification may be used in uplink (UL)communication and downlink (DL) communication. For example, when UL-MUcommunication which is solicited by a trigger frame is performed, atransmitting STA (e.g., AP) may allocate a first RU (e.g.,26/52/106/242-RU, etc.) to a first STA through the trigger frame, andmay allocate a second RU (e.g., 26/52/106/242-RU, etc.) to a second STA.Thereafter, the first STA may transmit a first trigger-based PPDU basedon the first RU, and the second STA may transmit a second trigger-basedPPDU based on the second RU. The first/second trigger-based PPDU istransmitted to the AP at the same (or overlapped) time period.

For example, when a DL MU PPDU is configured, the transmitting STA(e.g., AP) may allocate the first RU (e.g., 26/52/106/242-RU. etc.) tothe first STA, and may allocate the second RU (e.g., 26/52/106/242-RU,etc.) to the second STA. That is, the transmitting STA (e.g., AP) maytransmit HE-STF, HE-LTF, and Data fields for the first STA through thefirst RU in one MU PPDU, and may transmit HE-STF, HE-LTF, and Datafields for the second STA through the second RU.

Information related to a layout of the RU may be signaled throughHE-SIG-B.

FIG. 8 illustrates a structure of an HE-SIG-B field.

As illustrated, an HE-SIG-B field 810 includes a common field 820 and auser-specific field 830. The common field 820 may include informationcommonly applied to all users (i.e., user STAs) which receive SIG-B. Theuser-specific field 830 may be called a user-specific control field.When the SIG-B is transferred to a plurality of users, the user-specificfield 830 may be applied only any one of the plurality of users.

As illustrated in FIG. 8 , the common field 820 and the user-specificfield 830 may be separately encoded.

The common field 820 may include RU allocation information of N*8 bits.For example, the RU allocation information may include informationrelated to a location of an RU. For example, when a 20 MHz channel isused as shown in FIG. 5 , the RU allocation information may includeinformation related to a specific frequency band to which a specific RU(26-RU/52-RU/106-RU) is arranged.

An example of a case in which the RU allocation information consists of8 bits is as follows.

TABLE 1 8 bits indices (B7 B6 B5 B4 Number B3 B2 B1 B0) #1 #2 #3 #4 #5#6 #7 #8 #9 of entries 00000000 26 26 26 26 26 26 26 26 26 1 00000001 2626 26 26 26 26 26 52 1 00000010 26 26 26 26 26 52 26 26 1 00000011 26 2626 26 26 52 52 1 00000100 26 26 52 26 26 26 26 26 1 00000101 26 26 52 2626 26 52 1 00000110 26 26 52 26 52 26 26 1 00000111 26 26 52 26 52 52 100001000 52 26 26 26 26 26 26 26 1

As shown the example of FIG. 5 , up to nine 26-RUs may be allocated tothe 20 MHz channel. When the RU allocation information of the commonfield 820 is set to “00000000” as shown in Table 1, the nine 26-RUs maybe allocated to a corresponding channel (i.e., 20 MHz). In addition,when the RU allocation information of the common field 820 is set to“00000001” as shown in Table 1, seven 26-RUs and one 52-RU are arrangedin a corresponding channel. That is, in the example of FIG. 5 , the52-RU may be allocated to the rightmost side, and the seven 26-RUs maybe allocated to the left thereof.

The example of Table 1 shows only some of RU locations capable ofdisplaying the RU allocation information.

For example, the RU allocation information may include an example ofTable 2 below.

TABLE 2 8 bits indices (B7 B6 B5 B4 Number B3 B2 B1 B0) #1 #2 #3 #4 #5#6 #7 #8 #9 of entries 01000y₂y₁y₀ 106 26 26 26 26 26 8 01001y₂y₁y₀ 10626 26 26 52 8

“01000y2y1y0” relates to an example in which a 106-RU is allocated tothe leftmost side of the 20 MHz channel, and five 26-RUs are allocatedto the right side thereof. In this case, a plurality of STAs (e.g.,user-STAs) may be allocated to the 106-RU, based on a MU-MIMO scheme.Specifically, up to 8 STAs (e.g., user-STAs) may be allocated to the106-RU, and the number of STAs (e.g., user-STAs) allocated to the 106-RUis determined based on 3-bit information (y2y1y0). For example, when the3-bit information (y2y1y0) is set to N, the number of STAs (e.g.,user-STAs) allocated to the 106-RU based on the MU-MIMO scheme may beN+1.

In general, a plurality of STAs (e.g., user STAs) different from eachother may be allocated to a plurality of RUs. However, the plurality ofSTAs (e.g., user STAs) may be allocated to one or more RUs having atleast a specific size (e.g., 106 subcarriers), based on the MU-MIMOscheme.

As shown in FIG. 8 , the user-specific field 830 may include a pluralityof user fields. As described above, the number of STAs (e.g., user STAs)allocated to a specific channel may be determined based on the RUallocation information of the common field 820. For example, when the RUallocation information of the common field 820 is “00000000”, one userSTA may be allocated to each of nine 26-RUs (e.g., nine user STAs may beallocated). That is, up to 9 user STAs may be allocated to a specificchannel through an OFDMA scheme. In other words, up to 9 user STAs maybe allocated to a specific channel through a non-MU-MIMO scheme.

For example, when RU allocation is set to “01000y2y1y0”, a plurality ofSTAs may be allocated to the 106-RU arranged at the leftmost sidethrough the MU-MIMO scheme, and five user STAs may be allocated to five26-RUs arranged to the right side thereof through the non-MU MIMOscheme. This case is specified through an example of FIG. 9 .

FIG. 9 illustrates an example in which a plurality of user STAs areallocated to the same RU through a MU-MIMO scheme.

For example, when RU allocation is set to “01000010” as shown in FIG. 9, a 106-RU may be allocated to the leftmost side of a specific channel,and five 26-RUs may be allocated to the right side thereof. In addition,three user STAs may be allocated to the 106-RU through the MU-MIMOscheme. As a result, since eight user STAs are allocated, theuser-specific field 830 of HE-SIG-B may include eight user fields.

The eight user fields may be expressed in the order shown in FIG. 9 . Inaddition, as shown in FIG. 8 , two user fields may be implemented withone user block field.

The user fields shown in FIG. 8 and FIG. 9 may be configured based ontwo formats. That is, a user field related to a MU-MIMO scheme may beconfigured in a first format, and a user field related to a non-MIMOscheme may be configured in a second format. Referring to the example ofFIG. 9 , a user field 1 to a user field 3 may be based on the firstformat, and a user field 4 to a user field 8 may be based on the secondformat. The first format or the second format may include bitinformation of the same length (e.g., 21 bits).

Each user field may have the same size (e.g., 21 bits). For example, theuser field of the first format (the format of the MU-MIMO scheme) may beconfigured as follows.

For example, a first bit (e.g., B0-B10) within the User field (i.e., 21bits) may include identification information of a User STA (e.g.,STA-ID, partial AID, and so on) to which the corresponding User field isallocated. Additionally, a second bit (e.g., B11-B14) within the Userfield (i.e., 21 bits) may include information related to spatialconfiguration.

In addition, a third bit (i.e., B15-18) in the user field (i.e., 21bits) may include modulation and coding scheme (MCS) information. TheMCS information may be applied to a data field in a PPDU includingcorresponding SIG-B.

An MCS, MCS information, an MCS index, an MCS field, or the like used inthe present specification may be indicated by an index value. Forexample, the MCS information may be indicated by an index 0 to an index11. The MCS information may include information related to aconstellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM,256-QAM, 1024-QAM, etc.) and information related to a coding rate (e.g.,1/2, 2/3, 3/4, 5/6e, etc.). Information related to a channel coding type(e.g., LCC or LDPC) may be excluded in the MCS information.

In addition, a fourth bit (i.e., B19) in the user field (i.e., 21 bits)may be a reserved field.

In addition, a fifth bit (i.e., B20) in the user field (i.e., 21 bits)may include information related to a coding type (e.g., BCC or LDPC).That is, the fifth bit (i.e., B20) may include information related to atype (e.g., BCC or LDPC) of channel coding applied to the data field inthe PPDU including the corresponding SIG-B.

The aforementioned example relates to the user field of the first format(the format of the MU-MIMO scheme). An example of the user field of thesecond format (the format of the non-MU-MIMO scheme) is as follows.

A first bit (e.g., B0-B10) in the user field of the second format mayinclude identification information of a user STA. In addition, a secondbit (e.g., B11-B13) in the user field of the second format may includeinformation related to the number of spatial streams applied to acorresponding RU. In addition, a third bit (e.g., B14) in the user fieldof the second format may include information related to whether abeamforming steering matrix is applied. A fourth bit (e.g., B15-B18) inthe user field of the second format may include modulation and codingscheme (MCS) information. In addition, a fifth bit (e.g., B19) in theuser field of the second format may include information related towhether dual carrier modulation (DCM) is applied. In addition, a sixthbit (i.e., B20) in the user field of the second format may includeinformation related to a coding type (e.g., BCC or LDPC).

Hereinafter, a PPDU transmitted/received in an STA of the presentspecification will be described.

FIG. 10 illustrates an example of a PPDU used in the present disclosure.

The PPDU of FIG. 10 may be referred to as various terms, such as EHTPPDU, transmitting PPDU, receiving PPDU, first type or Nth type PPDU,and so on. For example, in the present specification, PPDU or EHT PPDUmay be referred to by using various terms, such as transmission PPDU,reception PPDU, first type or Nth type PPDU, and so on. Additionally,the EHT PPDU may be used in an EHT system and/or a new WLAN system,which is an enhanced version of the EHT system.

The PPDU of FIG. 10 may represent part or all of a PPDU type that isused in an EHT system. For example, the example of FIG. 10 may be usedfor both single-user (SU) mode and multi-user (MU) mode. In other words,the PPDU of FIG. 10 may be a PPDU for one receiving STA or a PPDU formultiple receiving STAs. In case the PPDU of FIG. 10 is used for aTrigger-based (TB) mode, an EHT-SIG of FIG. 10 may be omitted. In otherwords, an STA that has received a Trigger frame for Uplink-MU (UL-MU)communication may transmit a PPDU, from which the EHT-SIG is omitted inthe example of FIG. 10 .

In FIG. 10 , L-STF to EHT-LTF may be referred to as a preamble orphysical preamble, and the L-STF to EHT-LTF may begenerated/transmitted/received/obtained/decoded in a physical layer.

Subcarrier spacing of the L-LTF, L-STF, L-SIG, RL-SIG, U-SIG, andEHT-SIG fields of FIG. 10 may be determined as 312.5 kHz, and subcarrierspacing of the EHT-STF, EHT-LTF, Data fields may be determined as 78.125kHz. That is, tone indexes (or subcarrier indexes) of the L-STF, L-LTF,L-SIG, RL-SIG, U-SIG, and EHT-SIG fields may be indicated in 312.5 kHzunits, and tone indexes (or subcarrier indexes) of the EHT-STF, EHT-LTF,Data fields may be indicated in 78.125 kHz units.

In the PPDU of FIG. 10 , L-LTF and L-STF may be the same as the fieldsof the prior art (or related art).

The L-SIG field of FIG. 10 may, for example, include 24 bits of bitinformation. For example, the 24-bit information may include a 4-bitRate field, 1 Reserved bit, a 12-bit Length field, 1 Parity bit, and 6Tail bits. For example, the 12-bit Length field may include informationrelated to a PPDU length or time duration. For example, a value of the12-bit Length field may be determined based on a type of the PPDU. Forexample, in case the PPDU is a non-HT PPDU, an HT PPDU, a VHT PPDU, oran EHT PPDU, the value of the Length field may be determined as amultiple of 3. For example, in case the PPDU is an HE PPDU, the value ofthe Length field may be determined as “a multiple of #+1” or “a multipleof #+2”. In other words, a value of the Length field for a non-HT PPDU,an HT PPDU, a VHT PPDU, or an EHT PPDU may be determined as a multipleof 3, and a value of the Length field for an HE PPDU may be determinedas “a multiple of 3+1” or “a multiple of #+2”.

For example, a transmitting STA may apply BCC encoding, which is basedon a 1/2-code rate for 24-bit information of the L-SIG field.Afterwards, the transmitting STA may obtain 48 bits of BCC encodingbits. Then, BPSK modulation may be applied to the 48 encoding bits so asto generate 48 BPSK symbols. The transmitting STA may map the 48 BPSKsymbols to positions excluding a pilot subcarrier {Subcarrier indexes−21, −7, +7, +21} and a DC subcarrier {Subcarrier index 0}. As a result,the 48 BPSK symbols may be mapped to subcarrier indexes −26 to −22, −20to −8, −6 to −1, +1 to +6, +8 to +20, and +22 to +26. The transmittingSTA may additionally map a signal of {−1, −1, −1, 1} to subcarrierindexes {−28, −27, +27, +28}. The aforementioned signal may be used forchannel estimation for a frequency domain corresponding to {−28, −27,+27, +28}.

The transmitting STA may generate an RL-SIG, which is generatedidentically as the L-SIG. The receiving STA may know that the receptionPPDU is an HE PPDU or EHT PPDU based on the presence (or existence) ofan RL-SIG.

A Universal SIG (U-SIG) may be inserted after the RL-SIG of FIG. 10 .The U-SIG may also be referred to by using various terms, such as afirst SIG field, a first SIG, a first-type SIG, a control signal, acontrol signal field, a first (type) control signal, and so on.

The U-SIG may include N-bit information and may also include informationfor identifying the EHT PPDU type. For example, the U-SIG may beconfigured based on 2 symbols (e.g., two contiguous OFDM symbols). Eachsymbol (e.g., OFDM symbol) for the U-SIG may have a duration of 4 us.Each symbol of the U-SIG may be used for transmitting 26-bitinformation. For example, each symbol of the U-SIG may betransmitted/received based on 52 data tones and 4 pilot tones.

For example, A-bit information (e.g., 52 un-coded bits) may betransmitted through the U-SIG (or U-SIG field), and a first symbol ofthe U-SIG may transmit first X-bit information (e.g., 26 un-coded bits)among the total of A bits of the corresponding information, and a secondsymbol of the U-SIG may transmit remaining Y-bit information (e.g., 26un-coded bits) of the A-bit information. For example, the transmittingSTA may obtain 26 un-coded bits that are included in each U-SIG symbol.The transmitting STA may perform convolutional encoding (i.e., BCCencoding) based on a rate of R=1/2 so as to generate 52-coded bits, and,then, the transmitting STA may perform interleaving on the 52-codedbits. The transmitting STA may perform BPSK modulation on theinterleaved 52-coded bits, so as to generate 52 BPSK symbols that areallocated to each U-SIG symbol. One U-SIG symbol may be transmittedbased on 56 tones (subcarriers) starting from subcarrier index −28 tosubcarrier index +28, with the exception for DC index 0. The 52 BPSKsymbols that are generated by the transmitting STA may be transmittedbased on the remaining tones (subcarriers) excluding the pilot tones−21, −7, +7, +21 tones.

For example, the A-bit information (e.g., 52 un-coded bits) may includea CRC field (e.g., 4-bit length field) and a Tail field (e.g., 6-bitlength field). The CRC field and the Tail field may be transmittedthrough the second symbol of the U-SIG. The CRC field may be generatedbased on the 26 bits being allocated to the first symbol of the U-SIGand the remaining 16 bits excluding the CRC/Tail fields from the secondsymbol. And, the CRC field may be generated based on the related art CRCcalculation algorithm. Additionally, the Tail field may be used forterminating a trellis of a convolutional decoder and may, for example,be configured as “ ”.

The A-bit information (e.g., 52 un-coded bits) being transmitted by theU-SIG (or U-SIG field) may be divided into version-independent bits andversion-dependent bits. For example, a size of the version-independentbits may be fixed or variable. For example, the version-independent bitsmay be allocated only to the first symbol of the U-SIG or may beallocated to both the first and second symbols of the U-SIG. Forexample, the version-independent bits and the version-dependent bits maybe referred to by using various terms, such as a first control bit and asecond control bit.

For example, the version-independent bits of the U-SIG may include a3-bit PHY version identifier. For example, the 3-bit PHY versionidentifier may include information related to the PHY version of thetransmission/reception PPDU. For example, a first value of the 3-bit PHYversion identifier may indicate that the transmission/reception PPDU isan EHT PPDU. In other words, when the transmitting STA transmits the EHTPPDU, the transmitting STA may configure the 3-bit PHY versionidentifier as the first value. In other words, based on the PHY versionidentifier having the first value, the receiving STA may determine thatthe reception PPDU is an EHT PPDU.

For example, the version-independent bits of the U-SIG may include a1-bit UL/DL flag field. A first value of the 1-bit UL/DL flag field isrelated to UL communication, and a second value of the 1-bit UL/DL flagfield is related to DL communication.

For example, the version-independent bits of the U-SIG may includeinformation related to the length of a TXOP, and information related toBSS color ID.

For example, in case the EHT PPDU is divided into various types (e.g.,EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDUrelated to TB mode, EHT PPDU related to Extended Range transmission, andso on), information related to the EHT PPDU type may be included in theversion-dependent bits of the U-SIG.

For example, the U-SIG may include information related to 1) a bandwidthfield including information related to a bandwidth, 2) a field includinginformation related to an MCS scheme being applied to the EHT-SIG, 3) anindication field including information related to whether or not a dualsubcarrier modulation (DCM) scheme is applied to the EHT-SIG, 4) a fieldincluding information related to a number of symbols being used for theEHT-SIG, 5) a field including information related to whether or not theEHT-SIG is generated throughout the whole band, 6) a field includinginformation related to an EHT-LTF/STF type, 7) a field indicating anEHT-LTF length and a CP length.

Preamble puncturing may be applied to the PPDU of FIG. 10 . Preamblepuncturing means applying puncturing to a partial band (e.g., aSecondary 20 MHz band) of the whole band of a PPDU. For example, when an80 MHz PPDU is transmitted, the STA may apply puncturing to a secondary20 MHz band of the 80 MHz band and may transmit the PPDU only through aprimary 20 MHz band and a secondary 40 MHz band.

For example, a pattern of preamble puncturing may be preset (orpredetermined). For example, when a first puncturing pattern is applied,the puncturing may be applied only for a secondary 20 MHz band withinthe 80 MHz band. For example, when a second puncturing pattern isapplied, the puncturing may be applied to only one of the two secondary20 MHz bands that are included in the secondary 40 MHz band within the80 MHz band. For example, when a third puncturing pattern is applied,the puncturing may be applied only to a secondary 20 MHz band that isincluded in a primary 80 MHz band within a 160 MHz band (or 80+80 MHzband). For example, when a fourth puncturing pattern is applied, andwhen a primary 40 MHz band that is included in a primary 80 MHz bandwithin a 160 MHz band (or 80+80 MHz band) is present, the puncturing maybe applied to at least one 20 MHz channel that does not belong to theprimary 40 MHz band.

Information related to the preamble puncturing that is applied to thePPDU may be included in the U-SIG and/or EHT-SIG. For example, a firstfield of the U-SIG may include information related to a contiguousbandwidth of the PPDU, and a second field of the U-SIG may includeinformation related to preamble puncturing that is applied to the PPDU.

For example, the U-SIG and EHT-SIG may include information related topreamble puncturing based on the following method. When the bandwidth ofa PPDU exceeds 80 MHz, the U-SIG may be separately configured in 80 MHzunits. For example, when the bandwidth of a PPDU is 160 MHz, a firstU-SIG for a first 80 MHz band and a second U-SIG for a second 80 MHzband may be included in the corresponding PPDU. In this case, a firstfield of the first U-SIG may include information related to the 160 MHzbandwidth, and a second field of the first U-SIG may include informationrelated to preamble puncturing (i.e., information related to a preamblepuncturing pattern) that is applied to the first 80 MHz band.Additionally, a first field of the second U-SIG may include informationrelated to the 160 MHz bandwidth, and a second field of the second U-SIGmay include information related to preamble puncturing (i.e.,information related to a preamble puncturing pattern) that is applied tothe second 80 MHz band. Meanwhile, an EHT-SIG that is contiguous to thefirst U-SIG may include information related to preamble puncturing(i.e., information related to a preamble puncturing pattern) that isapplied to the second 80 MHz band, and an EHT-SIG that is contiguous tothe second U-SIG may include information related to preamble puncturing(i.e., information related to a preamble puncturing pattern) that isapplied to the first 80 MHz band.

Additionally or alternatively, the U-SIG and EHT-SIG may includeinformation related to preamble puncturing based on the followingmethod. The U-SIG may include information related to preamble puncturing(i.e., information related to a preamble puncturing pattern) for allbands. That is, the EHT-SIG may not include information related topreamble puncturing, and only the U-SIG may include information relatedto preamble puncturing (i.e., information related to a preamblepuncturing pattern).

The U-SIG may be configured of 20 MHz units. For example, when an 80 MHzPPDU is configured, the U-SIG may be duplicated. That is, 4 identicalU-SIGs may be included in the 80 MHz PPDU. A PPDU that exceeds the 80MHz bandwidth may include different U-SIGs.

The EHT-SIG of FIG. 10 may include control information for the receivingSTA. The EHT-SIG may be transmitted through at least one symbol, the onesymbol may have a length of 4 us. Information on a number of symbolsthat are used for the EHT-SIG may be included in the U-SIG.

The EHT-SIG may include technical features of the HE-SIG-B, which isdescribed above with reference to FIG. 8 to FIG. 9 . For example, justas in the example of FIG. 8 , the EHT-SIG may include a common field anda user-specific field. The common field of the EHT-SIG may be omitted,and a number of user-specific fields may be determined based on a numberof users.

Just as in the example of FIG. 8 , the common field of the EHT-SIG andthe user-specific field of the EHT-SIG may be separately (or individual)coded. Although one User block field that is included in theuser-specific field may include information for two users, it may bepossible for a last user block field that is included in theuser-specific field to include information for one user. That is, oneuser block field of the EHT-SIG may include a maximum of two userfields. Just as in the example of FIG. 9 , each user field may berelated to MU-MIMO allocation or may be related to non-MU-MIMOallocation.

Just as in the example of FIG. 8 , the common field of the EHT-SIG mayinclude a CRC bit and a Tail bit. And, a length of the CRC bit may bedetermined to be equal to 4 bits, and a length of the Tail bit may bedetermined to be equal to 6 bits and may be set (or configured) as‘000000’.

Just as in the example of FIG. 8 , the common field of the EHT-SIG mayinclude RU allocation information. The RU allocation information maymean information related to the location of an RU to which multipleusers (i.e., multiple receiving STAs) are allocated. Just as shown inTable 1, the RU allocation information may be configured of 8-bit (orN-bit) units.

A mode having the common field of the EHT-SIG omitted may be supported.A mode wherein the common field of the EHT-SIG is omitted may bereferred to as a compressed mode. When the compressed mode is used,multiple users (i.e., multiple receiving STAs) of an EHT PPDU may decodethe PPDU (i.e., a data field of the PPDU) based on non-OFDMA. That is,multiple users of an EHT PPDU may decode a PPDU (i.e., a data field ofthe PPDU) that is received through a same frequency band. Meanwhile,when a non-compressed mode is used, multiple users of an EHT PPDU maydecode a PPDU (i.e., a data field of the PPDU) based on OFDMA. That is,multiple users of an EHT PPDU may receive a PPDU (i.e., a data field ofthe PPDU) through different frequency bands.

The EHT-SIG may be configured based on various MCS schemes. As describedabove, the information related to the MCS scheme being applied to theEHT-SIG may be included in the U-SIG. The EHT-SIG may be configuredbased on a DCM scheme. For example, among N number of data tones (e.g.,52 data tones) being allocated for the EHT-SIG, a first modulationscheme may be applied to one half of contiguous tones, and a secondmodulation scheme may be applied to the remaining half of contiguoustones. That is, the transmitting STA may modulate specific controlinformation to a first symbol based on the first modulation scheme andmay allocate the modulated first symbol to one half of contiguous tones.Thereafter, the transmitting STA may module the same control informationto a second symbol based on the second modulation scheme and mayallocated to modulated second symbol to the other half of contiguoustones. As described above, information related to whether or not the DCMscheme is applied to the EHT-SIG (e.g., 1 bit field) may be included inthe U-SIG. EHT-STF of FIG. 10 may be used for enhancing automatic gaincontrol estimation in a multiple input multiple output (MIMO)environment or OFDMA environment. And, EHT-LTF of FIG. 10 may be usedfor estimating a channel in a MIMO environment or OFDMA environment.

Information related to an STF and/or LTF type (including informationrelated to GI that is applied to the LTF) may be included in an SIG Afield and/or SIG B field of FIG. 10 .

The PPDU (i.e., EHT-PPDU) of FIG. 10 may be configured based on examplesof FIG. 5 and FIG. 6 .

For example, an EHT PPDU being transmitted over a 20 MHz band, i.e., a20 MHz EHT PPDU, may be configured based on RUs of FIG. 5 . That is, thelocation of an RU of the EHT-STF, EHT-LTF, data field being included inthe EHT PPDU may be determined as shown in FIG. 5 .

An EHT PPDU being transmitted over a 40 MHz band, i.e., a 40 MHz EHTPPDU, may be configured based on RUs of FIG. 6 . That is, the locationof an RU of the EHT-STF, EHT-LTF, data field being included in the EHTPPDU may be determined as shown in FIG. 6 .

Since the RU location of FIG. 6 corresponds to 40 MHz, if the pattern ofFIG. 6 is repeated two times, a tone plan for 80 MHz may be determined.That is, an 80 MHz EHT PPDU may be transmitted based on a new tone planin which the RU of FIG. 6 is repeated two times, and not the RU of FIG.7 .

In case the pattern of FIG. 6 is repeated two times, 23 tones (i.e., 11guard tones+12 guard tones) may be configured in a DC region. That is, atone plan for an 80 MHz EHT PPDU being allocated based on OFDMA may have23 DC tones. On the other hand, an 80 MHz EHT PPDU being allocated basedon non-OFDMA (i.e., non-OFDMA full Bandwidth 80 MHz PPDU) may beconfigured based on 996 RUs and may include 5 DC tones, 12 left-guardtones, and 11 right-guard tones.

A tone plan for 160/240/320 MHz may be configured to have a format ofrepeating the pattern of FIG. 6 multiple times.

The PPDU of FIG. 10 may be identified as an EHT PPDU based on thefollowing method.

A receiving STA may determine a type of an RX PPDU as the EHT PPDU,based on the following aspect. For example, the RX PPDU may bedetermined as the EHT PPDU: 1) when a first symbol after an L-LTF signalof the RX PPDU is a BPSK symbol; 2) when RL-SIG in which the L-SIG ofthe RX PPDU is repeated is detected; and 3) when a result of applying“modulo 3” to a value of a length field of the L-SIG of the RX PPDU isdetected as “0”. When the RX PPDU is determined as the EHT PPDU, thereceiving STA may detect a type of the EHT PPDU (e.g., anSU/MU/Trigger-based/Extended Range type), based on bit informationincluded in a symbol after the RL-SIG of FIG. 10 . In other words, thereceiving STA may determine the RX PPDU as the EHT PPDU, based on: 1) afirst symbol after an L-LTF signal, which is a BPSK symbol; 2) RL-SIGcontiguous to the L-SIG field and identical to L-SIG; and 3) L-SIGincluding a length field in which a result of applying “modulo 3” is setto “0”.

For example, the receiving STA may determine the type of the RX PPDU asthe EHT PPDU, based on the following aspect. For example, the RX PPDUmay be determined as the HE PPDU: 1) when a first symbol after an L-LTFsignal is a BPSK symbol; 2) when RL-SIG in which the L-SIG is repeatedis detected; and 3) when a result of applying “modulo 3” to a value of alength field of the L-SIG is detected as “1” or “2”.

For example, the receiving STA may determine the type of the RX PPDU asa non-HT, HT, and VHT PPDU, based on the following aspect. For example,the RX PPDU may be determined as the non-HT, HT and VHT PPDU: 1) when afirst symbol after an L-LTF signal is a BPSK symbol; and 2) when RL-SIGin which the L-SIG is repeated is not detected. In addition, the RX PPDUmay be determined as the non-HT, HT and VHT PPDU when a result ofapplying “modulo 3” to a value of a length field of the L-SIG isdetected as “0” even if the receiving STA detects the repetition ofRL-SIG.

In the following example, a signal represented by a (TX/RX/UL/DL)signal, a (TX/RX/UL/DL) frame, a (TX/RX/UL/DL) packet, a (TX/RX/UL/DL)data unit, (TX/RX/UL/DL) data, or the like may be a signaltransmitted/received based on the PPDU of FIG. 10 . The PPDU of FIG. 10may be used to transmit/receive various types of frames. For example,the PPDU of FIG. 10 may be used for a control frame. An example of thecontrol frame may include a request to send (RTS), a clear to send(CTS), a power save (PS)-poll, a BlockACKReq, a BlockAck, a null datapacket (NDP) announcement, and a trigger frame. For example, the PPDU ofFIG. 10 may be used for a management frame. An example of the managementframe may include a beacon frame, a (re-)association request frame, a(re-)association response frame, a probe request frame, and a proberesponse frame. For example, the PPDU of FIG. 10 may be used for a dataframe. For example, the PPDU of FIG. 10 may be used to simultaneouslytransmit at least two of the control frame, the management frame, andthe data frame.

FIG. 11 illustrates modified examples of a transmitting device and/orreceiving device of the present specification.

Each device/STA shown in sub-figures (a)/(b) of FIG. 1 may be modifiedas shown in FIG. 11 . A transceiver 630 of FIG. 11 may be the same asthe transceiver(s) 113 and 123 of FIG. 1 . The transceiver 630 of FIG.11 may include a receiver and a transmitter.

A processor 610 of FIG. 11 may be the same as the processor(s) 111 and121 shown in FIG. 1 . Alternatively, the processor 610 of FIG. 11 may bethe same as the processing chip(s) 114 and 124 shown in FIG. 1 .

A memory 150 of FIG. 11 may be the same as the memory(s) 112 and 122shown in FIG. 1 . Alternatively, the memory 150 of FIG. 11 may be aseparate external memory that is different from the memory(s) 112 and122 shown in FIG. 1 .

Referring to FIG. 11 , the power management module 611 manages power forthe processor 610 and/or the transceiver 630. The battery 612 suppliespower to the power management module 611. The display 613 outputsresults processed by the processor 610. The keypad 614 receives inputsto be used by the processor 610. The keypad 614 may be shown on thedisplay 613. The SIM card 615 may be an integrated circuit that isintended to securely store the international mobile subscriber identity(IMSI) number and its related key, which are used to identify andauthenticate subscribers on mobile telephony devices (such as mobilephones and computers).

Referring to FIG. 11 , the speaker 640 may output sound-related resultsprocessed by the processor 610. The microphone 641 may receivesound-related inputs to be used by the processor 610.

i. Subcarrier and Resource Allocation for Wideband

A wideband that is described in the present specification represents aband having a bandwidth of 80 MHz or wider (80 MHz, 160 MHz, and 320MHz). Tone plans (or resource unit (RU) layouts) being used in 20 MHzand 40 MHz bands are the same in 802.11ax and 802.11be (the RU layoutsof FIG. 5 and FIG. 6 are used without modification).

Data and pilot subcarrier indexes of the RUs in 20 MHz HE/EHT PPDU arefixed as described below. In the following table, a subcarrier having asubcarrier index of 0 corresponds to a DC tone. A subcarrier having asubcarrier index of a negative number corresponds to a subcarrier havinga frequency lower than the DC tone. And, a subcarrier having asubcarrier index of a positive number corresponds to a subcarrier havinga frequency higher than the DC tone. At this point, RU 5 is a middle 26tone RU.

TABLE 3 RU type RU index and subcarrier range 26-tone RU 1 RU 2 RU 3 RU4 RU 5 RU [−121: −96] [−95: −70] [−68: −43] [−42: −17] [−16: −4, 4: 16]RU 6 RU 7 RU 8 RU 9 [17: 42] [43: 68] [70: 95] [96: 121] 52-tone RU 1 RU2 RU 3 RU 4 RU [−121: −70] [−68: −17] [17: 68] [70: 121] 106-tone RU 1RU 2 RU [−122: −17] [17: 122] 242-tone RU 1 RU [−122: −2, 2: 122] Thesubcarrier index of 0 corresponds to the DC tone. Negative subcarrierindices correspond to subcarries with frequency lower than the DC tone,and positive subcarrier indices correspond to subcarriers with frequencyhigher than the DC tone RU 5 is the middle 26-tone RU.

Data and pilot subcarrier indexes of the RUs in 40 MHz HE/EHT PPDU arefixed as described below. In the following table, a subcarrier having asubcarrier index of 0 corresponds to a DC tone. A subcarrier having asubcarrier index of a negative number corresponds to a subcarrier havinga frequency lower than the DC tone. And, a subcarrier having asubcarrier index of a positive number corresponds to a subcarrier havinga frequency higher than the DC tone.

TABLE 4 RU type RU index and subcarrier range 26-tone RU 1 RU 2 RU 3 RU4 RU 5 RU [−243: −218] [−217: −192] [−189: −164] [−163: −138] [−136:−111] RU 6 RU 7 RU 8 RU 9 [−109: −84] [−83: −58] [−55: −30] [−29: −4] RU10 RU 11 RU 12 RU 13 RU 14 [4: 29] [30: 55] [58: 83] [84: 109] [111:136] RU 15 RU 16 RU 17 RU 18 [138: 163] [164: 189] [192: 217] [218: 243]52-tone RU 1 RU 2 RU 3 RU 4 RU [−243: −192] [−189: −138] [−109: −58][−55: −4] RU 5 RU 6 RU 7 RU 8 [4: 55] [58: 109] [138: 189] [192: 243]106-tone RU 1 RU 2 RU 3 RU 4 RU [−243: −138] [−109: −4] [4: 109] [138:243] 242-tone RU 1 RU 2 RU [−244: −3] [3: 244] 484-tone RU 1 RU [−244:−3, 3: 244]

However, for a wideband, since a tone plan of 802.11be and a tone planof 802.11ax are defined differently, the tone plan for a 80 MHz bandwill be described as follows.

FIG. 12 illustrates a tone plan for an 80 MHz PPDU in an 802.11be WLANsystem.

Tone plans and RU locations for 20 MHz and 40 MHz PPDUs in the 802.11beWLAN system are the same as those in the 802.11 ax WLAN system. FIG. 12shows an EHT tone plan and RU locations for an 80 MHz PPDU. An EHT PPDUbeing extended to a 160 MHz band or wider is configured of multiple 80MHz sub-blocks. The tone plan for each 80 MHz sub-block is the same asthe tone plan for the 80 MHz EHT PPDU. When an 80 MHz sub-block is notpunctured and a full (or whole) 80 MHz sub-block is used as an RU orpart of an RU or MRU within an 80/160/320 MHz PPDU, the 80 MHz sub-blockuses 996 tone RUs, as shown in FIG. 12 . When an 80 MHz sub-block ispunctured, or when a full (or whole) 80 MHz sub-block is not used as anRU or part of an RU or MRU within the 80/160/320 MHz PPDU, the 80 MHzsub-block uses a tone plan excluding 996 tone RUs, as shown in FIG. 12 .

Data and pilot subcarrier indexes of the RUs in an 80 MHz EHT PPDU arefixed as described below. In the following table, a subcarrier having asubcarrier index of 0 corresponds to a DC tone. A subcarrier having asubcarrier index of a negative number corresponds to a subcarrier havinga frequency lower than the DC tone. And, a subcarrier having asubcarrier index of a positive number corresponds to a subcarrier havinga frequency higher than the DC tone. Additionally, in 802.11be, sincethe middle 26 tone RU is not defined in the tone plan for the 80 MHzband, RU 19 is indicated as “not defined”.

TABLE 5 RU type RU index and subcarrier range 26-tone RU 1 RU 2 RU 3 RU4 RU 5 RU [−499: −474] [−473: −448] [−445: −420] [−419: −394] [−392:−367] RU 6 RU 7 RU 8 RU 9 [−365: −340] [−339: −314] [−311: −286] [−285:−260] RU 10 RU 11 RU 12 RU 13 RU 14 [−252: −227] [−226: −201] [−198:−173] [−172: −147] [−145: −120] RU 15 RU 16 RU 17 RU 18 RU 19 [−118:−93] [−92: −67] [−64: −39] [−38: −13] [not defined] RU 20 RU 21 RU 22 RU23 RU 24 [13: 38] [39: 64] [67: 92] [93: 118] [120: 145] RU 25 RU 26 RU27 RU 28 [147: 172] [173: 198] [201: 226] [227: 252] RU 29 RU 30 RU 31RU 32 RU 33 [260: 285] [286: 311] [314: 339] [340: 365] [367: 392] RU 34RU 35 RU 36 RU 37 [394: 419] [420: 445] [448: 473] [474: 499] 52-tone RU1 RU 2 RU3 RU 4 RU [−499: −448] [−445: −394] [−365: −314] [−311: −260]RU 5 RU 6 RU 7 RU 8 [−252: −201] [−198: −147] [−118: −67] [−64: −13] RU9 RU 10 RU 11 RU 12 [13: 64] [67: 118] [147: 198] [201: 252] RU 13 RU 14RU 15 RU 16 [260: 311] [314: 365] [394: 445] [448: 499] 106-tone RU 1 RU2 RU 3 RU 4 RU [−499: −394] [−365: −260] [−252: −147] [−118: −13] RU 5RU 6 RU 7 RU 8 [13: 118] [147: 252] [260: 365] [394: 499] 242-tone RU 1RU 2 RU 3 RU 4 RU [−500: −259] [−253: −12] [12: 253] [259: 500] 484-toneRU 1 RU 2 RU [−500: −259, [12: 253, −263: −12] 289: 500] 996-tone RU 1RU [−500: −3, 3: 500]

Additionally, in 802.11be, the tone plan for the 160 MHz band isconfigured of the tone plan of FIG. 12 being repeated two times. Herein,data and pilot subcarrier indexes of the RUs in the 160 MHz EHT PPDU maybe fixed based on Table 5. And, in 802.11be, the tone plan for the 320MHz band is configured of the tone plan of FIG. 12 being repeated fourtimes. Herein, data and pilot subcarrier indexes of the RUs in the 320MHz EHT PPDU may be fixed based on Table 5.

Furthermore, in 802.11be, Multiple RUs (MRU(s)) may be allocated to theEHT STA, and subcarrier indexes of the MRU may be configured of the RUindexes shown in Table 5.

2. Non-AP STA Operating in 20 MHz

A non-AP EHT STA operating in 20 MHz is a non-AP EHT STA having itscurrent operating mode support a maximum channel width of 20 MHz. Asupported channel width of the Non-AP EHT STA is indicated in aSupported Channel Width subfield of an HE PHY Capabilities Informationfield. In a 6 GHz subfield of an EHT Capabilities element, supported andoperating channel width for 320 MHz may be updated along with a ChannelWidth subfield of the OM Control subfield, or a Channel Extensionsubfield of the EHT OM Control subfield and the OM Control subfield thatis transmitted from the EHT STA, when an Operating Mode Notificationframe, an Operating Mode Notification element having an Rx NSS typesubfield being equal to 0, or an EHT OM Control subfield do not exist inthe same A-Control field.

A non-AP EHT STA operating in 20 MHz is a 20 MHz only non-AP EHT STA, ora non-AP EHT STA that can operate only in a 20 MHz channel width, suchas a non-AP EHT STA reducing its operating channel width to 20 MHz.

A non-AP EHT STA operating in 20 MHz shall be capable of participatingin 20 MHz, 40 MHz, 80 MHz or 160 MHz EHT DL and UL OFDMA transmission. Anon-AP EHT STA operating in 20 MHz other than the 20 MHz only non-AP EHTSTA shall also be capable of participating in a 320 MHz EHT DL and ULOFDMA transmission.

When participating in EHT DL and UL OFDMA transmission using a PPDUbandwidth of 20 MHz, the non-AP EHT STA operating in 20 MHz shallsupport 26 tone RUs, 52 tone RUs, 106 tone RUs, 242 tone RUs, 52+26 toneMRUs and 106+26 tone MRUs. The EHT AP shall be capable of allocating RUsor MRUs of a 20 MHz EHT MU PPDU or EHT TB PPDU to a non-AP EHT STAoperating in 20 MHz.

When participating in EHT DL and UL OFDMA transmission using a PPDUbandwidth greater than 20 MHz and less than 320 MHz, the non-AP EHT STAoperating in 20 MHz may support 26 tone RUs, 52 tone RUs, 106 tone RUs,52+26 tone MRUs. When participating in EHT DL and UL OFDMA transmissionusing a PPDU bandwidth of 320 MHz, a non-AP EHT STA operating in 20 MHzother than the 20 MHz only non-AP EHT STA shall also support 26 toneRUs, 52 tone RUs, 106 tone RUs and 52+26 tone MRUs at the previouslyallowed locations. When participating in EHT DL transmission using aPPDU bandwidth of 320 MHz, a non-AP EHT STA operating in 20 MHz otherthan the 20 MHz only non-AP EHT STA may also support 242-tone RUs. AnEHT AP having an operating channel width greater than 20 MHz mayallocate RUs or MRUs in a 20 MHz channel within a BSS bandwidth in a 40MHz, 80 MHz or 160 MHz EHT MU PPDU or EHT TB PPDU, to a non-AP EHT STAoperating in 20 MHz, in accordance with an operating channel width ofthe AP. The operating channel of the AP is the same as the BSS channelwidth. An EHT AP having a 320 MHz operating channel width shall becapable of allocating RUs or MRUs of a 20 MHz channel within a BSSbandwidth of a 320 MHz EHT MU PPDU or EHT TB PPDU, to a non-AP EHT STAoperating in 20 MHz other than the 20 MHz only non-AP EHT STA. When theEHT AP allocates RUs or MRUs to a non-AP EHT STA operating in 20 MHz,the EHT AP shall follow the restrictions (or limitations) on 20 MHzoperation, which will be described later on.

The non-AP EHT STA operating in 20 MHz shall be capable of transmittingpreamble and data from the RUs or MRUs that are allocated to the 20 MHzchannel operating in the 20 MHz, 40 MHz, 80 MHz or 160 MHz EHT TB PPDU.A non-AP EHT STA operating in 20 MHz other than the 20 MHz only non-APEHT STA shall also be capable of transmitting preamble and data from theRUs or MRUs that are allocated to the 20 MHz channel operating in the320 MHz EHT TB PPDU. When the EHT AP allocates the RUs or MRUs to anon-AP EHT STA operating in 20 MHz, the EHT AP shall follow therestrictions (or limitations) on 20 MHz operation, which will bedescribed later on.

The non-AP EHT STA operating in 20 MHz shall be capable of supportingpreamble and data reception in the RUs or MRUs that are allocated to the20 MHz channel operating in the 20 MHz, 40 MHz, 80 MHz or 160 MHz EHT MUPPDU. A non-AP EHT STA operating in 20 MHz other than the 20 MHz onlynon-AP EHT STA shall also be capable of supporting preamble and datareception in the RUs or MRUs that are allocated to the 20 MHz channeloperating in the 320 MHz EHT MU PPDU. RU and MRU restrictions (orlimitations) for 20 MHz operations will be described later on.

When the non-AP EHT STA operating in 20 MHz does not configure (or set)a Subchannel Selective Transmission (SST) operation in a non-primary 20MHz channel along with the EHT AP, the EHT AP shall not allocate RUs orMRUs located outside of a primary 20 MHz in the 80 MHz, 160 MHz or 320MHz EHT MU PPDU or EHT TB PPDU to the non-AP EHT STA operating in 20MHz.

3. Embodiment(s) Applicable to the Present Specification

In order to increase a peak throughput, the 802.11be WLAN system isconsidering the transmission of increased streams by using a band thatis wider than the legacy 802.11 ax, or by using a larger number ofantennas. Moreover, the present specification is also considering amethod of using various bands/links by performing aggregation.

Meanwhile, a 20 MHz only or operating non-AP STA may be used in a 2.4GHz or 5 GHz band (herein, the corresponding non-AP STA may also beadditionally used in a 6 GHz band). And, in this case, the 20 MHz onlyor operating non-AP STA may be allocated to RUs within a specific 20 MHzsubchannel of a 20 MHz PPDU as well as a 40/80/160/320 MHz PPDU, therebybeing capable of transmitting/receiving data. In such situation, thepresent specification proposes RUs in 20 MHz that cannot be allocated tothe 20 MHz only or operating STA. Herein, a 20 MHz operating STA is anon-AP EHT STA operating in a 20 MHz channel width mode, whichrepresents a case where the STA is the same as a 20 MHz only non-AP EHTSTA or an EHT STA that reduces its operating channel width to 20 MHz byusing Operating Mode Indication (OMI). The 20 MHz only STA correspondsto the 20 MHz only non-AP EHT STA, which means that the STA is a non-APEHT STA that only supports a 20 MHz channel width for a frequency bandin a Supported Channel Width Set subfield, which is included in an HEPHY Capabilities Information field of the HE Capabilities element.

FIG. 13 illustrates an example of RU that cannot be allocated to a 20MHz only or operating STA in a 40 MHz PPDU transmission.

The present specification proposes each RU and MRU within 242 RUs thatcannot be allocated to the 20 MHz only or operating STA in eachbandwidth PPDU transmission situation. Since the tone plan of eachbandwidth is different from the tone plan of 20 MHz, the 20 MHz only oroperating STA cannot be allocated to the corresponding RU(s) and MRU(s)because the tones corresponding to the DC tone and guard tones are usedfor transmitting actual data during the 20 MHz receiver process.Accordingly, due to the possibility of performance degradation andinterference on an adjacent channel, allocation of specific RU(s) andMRU(s) is limited. For example, as shown in FIG. 13 , the RU part thatis marked as a shaded area in 40 MHz corresponds to RUs including DC orguard tone(s) in the 20 MHz receiver process.

Therefore, the RUs being marked as shaded areas in FIG. 13 may not beallocated to the 20 MHz only or operating STA during the 40 MHztransmission. However, since performance degradation may be overcome inaccordance with a data subcarrier loss rate, some RUs may be used beingallocated to the 20 MHz only or operating STA.

3.1 20 MHz

FIG. 14 illustrates examples of 26+52 tone MRUs and 26+106 tone MRUsthat are used in a 20 MHz EHT PPDU OFDMA transmission.

A 20 MHz EHT PPDU transmission uses the same tone plan as the existing11ax. And, most particularly, when considering 26+52RU, whichcorresponds to one MRU, a tone plan shown in FIG. 14 may be used. In a20 MHz EHT PPDU, the 20 MHz only or operating STA may be allocated toall RUs and MRUs that are defined in the corresponding bandwidth.

3.2 40 MHz

FIG. 15 illustrates examples of 26+52 tone MRUs and 26+106 tone MRUsthat are used in a 40 MHz EHT PPDU OFDMA transmission.

A 40 MHz EHT PPDU transmission uses the same tone plan as the existing11ax. And, most particularly, when considering 26+52RU, whichcorresponds to one MRU, a tone plan shown in FIG. 15 may be used. RUsand MRUs that cannot be allocated to the 20 MHz only or operating STAare proposed per size of each RU and MRU, as described below. Indexes ofthe RUs described below are described as being the same as the RUindexes shown in Table 4.

26RU: 5th, 9th, 10th, 14th 26RU

52RU: 4th, 5th 52RU

26+52RU (78RU): 5th 26RU+2nd 52RU, 14th 26RU+6th 52RU

106RU: 2nd, 3rd 106RU

26+106RU: 5th 26RU+1st 106RU, 5th 26RU+2nd 106RU, 14th 26RU+3rd 106RU,14th 26RU+4th 106RU, i.e., all 26+106RU

242RU: all 242RU

Apart from the RUs and MRUs listed above, RUs and MRUs within another242RU may be allocated to the 20 MHz only or operating STA.

However, when considering DC, guard tones corresponding to the 20 MHzreceiver process, since the data loss rate of the underlined RUs or MRUsis not significant, sufficiently reliable performance may be achieved bycoding gain, when performing decoding. Therefore, the underlined RUs orMRUs may also be allocated to the 20 MHz only or operating STA.

4.3. Each 80 MHz Subchannel in a Bandwidth of 80 MHz or Wider

Each 80 MHz subchannel of a PPDU using bandwidths of 80 MHz and wider(160 MHz, 320 MHz) uses the legacy 11ax and the tone plan shown in FIG.12 .

FIG. 16 illustrates examples of 26+52 tone MRUs that are used in an 80MHz EHT PPDU OFDMA transmission.

FIG. 16 shows a tone plan considering a 26+52 tone MRU in the tone planof FIG. 12 .

FIG. 17 illustrates examples of 26+106 tone MRUs that are used in an 80MHz EHT PPDU OFDMA transmission.

FIG. 17 shows a tone plan considering a 26+106 tone MRU in the tone planof FIG. 12 .

RUs and MRUs that cannot be allocated to the 20 MHz only or operatingSTA are proposed per size of each RU and MRU, as described below, ineach 80 MHz subchannel of the PPDU using a bandwidth of 80 MHz or wider(160 MHz, 320 MHz). Indexes of the RUs described below are described asbeing the same as the RU indexes shown in Table 5. Herein, however, inTable 5, although the 19th 26RU, which is the middle 26RU, is indicatedas an index, the corresponding RU is specified as being “not defined”.Accordingly, the indexes of the RUs that will be described later onindicate that an index is not assigned for the middle 26RU. For example,the 23rd, 27th, 28th, 32nd 26RUs, which will be described later on, arerespectively indicated as RU 24, RU 28, RU 29, RU 33, in Table 5.

26RU: 5th, 9th, 10th, 14th, 23th, 27th, 28th, 32th 26RU

52RU: 4th, 5th, 12th, 13th 52RU

26+52RU (78RU): 5th 26RU+2nd 52RU, 14th 26RU+6th 52RU, 23rd 26RU+10th52RU, 32nd 26RU+14th 52RU

106RU: 2th, 3th, 6th, 7th 106RU

26+106RU: 5th 26RU+1st 106RU, 14th 26RU+4th 106RU, 23rd 26RU+5th 106RU,32nd 26RU+8th 106RU, i.e., all 26+106RU

242RU: all 242RU

Apart from the RUs and MRUs listed above, RUs and MRUs within another242RU may be allocated to the 20 MHz only or operating STA.

However, when considering DC, guard tones corresponding to the 20 MHzreceiver process, since the data loss rate of the underlined RUs or MRUsis not significant, sufficiently reliable performance may be achieved bycoding gain, when performing decoding. Therefore, the underlined RUs orMRUs may also be allocated to the 20 MHz only or operating STA.

Although it is specified that the underlined RUs or MRUs can beallocated to the 20 MHz only or operating STA, among the correspondingRUs or MRUs, 26+52RUs and 26+106RUs, and all 242RUs may not be allocatedto the 20 MHz only or operating STA due to the DC tone issue. Mostparticularly, in an uplink (UL) trigger-based (TB) PPDU, the 26+52RUsand 26+106RUs, and all 242RUs may not be allocated to the 20 MHz only oroperating STA. Additionally, in a downlink (DL) transmission, althoughthe allocation of the aforementioned underlined RUs or MRUs may not beadvantageous in light of performance, since the performance may beenhanced by implementation, the corresponding RUs or MRUs may be used bybeing allocated to the 20 MHz only or operating STA.

Although it is specified that the underlined RUs or MRUs can beallocated to the 20 MHz only or operating STA, when performing 1024Quadrature Amplitude Modulation (QAM) or 4096QAM or stream transmissionexceeding 8 streams, part or all of the underlined RUs or MRUs may notbe allocated to the 20 MHz only or operating STA. For example, whenperforming 1024QAM or 4096QAM or stream transmission exceeding 8streams, among the aforementioned underlined RUs or MRUs, the 26+52RUsand 26+106RUs, and all 242RUs may not be allocated to the 20 MHz only oroperating STA.

FIG. 18 is a procedure flowchart showing operations of a transmittingdevice according to the present embodiment.

An example of FIG. 18 may be performed by a transmitting STA ortransmitting device (AP and/or non-AP STA).

Part of the steps (or detailed sub-steps that will be described lateron) in the example of FIG. 18 may be skipped (or omitted) or varied.

By performing step S1810, the transmitting device (transmitting STA) mayobtain information related to the above-described tone plan. Asdescribed above, the information related to the tone plan includes RUsize, RU location, control information related to the RU(s), informationrelated to a frequency band including the RU(s), information on an STAreceiving the RU(s), and so on.

By performing step S1820, the transmitting device may configure/generatea PPDU based on the obtained control information. The step ofconfiguring/generating a PPDU may include a step ofconfiguring/generating each field of the PPDU. That is, step S1820includes a step of configuring an EHT-SIG field including controlinformation related to a Tone Plan. That is, step S1820 may include astep of configuring a field including control information indicating RUsize/location (e.g., N bitmap), and/or a step of configuring a fieldincluding an identifier (e.g., AID) of an STA receiving the RU.

Additionally, step S1820 may include a step of generating an STF/LTFsequence that is transmitted through a specific RU. The STF/LTF sequencemay be generated based on a preset STF generating sequence/LTFgenerating sequence.

Additionally, step S1820 may include a step of generating a data field(i.e., MPDU) that is transmitted through a specific RU.

The transmitting device may transmit the PPDU that is configured byperforming step S1820, to the receiving device, based on step S1830.

While performing step S1830, the transmitting device may perform atleast one of the operations of CSD, Spatial Mapping, IDFT/IFFToperation, GI insertion, and so on.

The signal(s)/field(s)/sequences(s) that is/are configured according tothe present specification may be transmitted in the format of FIG. 10 .

FIG. 19 is a procedure flowchart showing operations of a receivingdevice according to the present embodiment.

The above-described PPDU may be received according to the example ofFIG. 18 .

An example of FIG. 19 may be performed by a receiving STA or receivingdevice (AP and/or non-AP STA).

Part of the steps (or detailed sub-steps that will be described lateron) in the example of FIG. 19 may be skipped (or omitted).

The receiving device (receiving STA) may receive all or part of a PPDUby performing step S1910. The received signal may have the format shownin FIG. 10 .

A sub-step of step S1910 may be determined based on step S1830 of FIG.18 . That is, step S1910 may perform operations of recovering (orreconfiguring) the results of the operations of CSD, Spatial Mapping,IDFT/IFFT operation, GI insertion, and so on, which are applied in stepS1830.

In step S1920, the receiving device may perform decoding on all/part ofthe PPDU. Additionally, the receiving device may obtain controlinformation related to a Tone Plan (i.e., RU) from the decoded PPDU.

More specifically, the receiving device may decode an L-SIG and EHT-SIGof the PPDU based on Legacy STF/LTF and may obtain information that isincluded in the L-SIG and EHT SIG fields. Information related to variousTone Plans (i.e., RUs) specified in the present specification may beincluded in the EHT-SIG, and the receiving STA may obtain informationrelated to the Tone Plans (i.e., RUs) through the EHT-SIG.

In step S1930, the receiving device may decode the remaining part of thePPDU based on the information related to the Tone Plans (i.e., RUs) thatis obtained by performing step S1920. For example, the receiving STA maydecode the STF/LTF field(s) of the PPDU based on the information relatedto the Tone Plans (i.e., RUs). Additionally, the receiving STA maydecode the data field of the PPDU based on the information related tothe Tone Plans (i.e., RUs) and may obtain an MPDU that is included inthe data field.

Additionally, the receiving device may perform a processing operation offorwarding (or delivering) decoded data, which is decoded by performingstep S1930, to a higher layer (e.g., MAC layer). Additionally, in casesignal generation is instructed from the higher layer to a PHY layer forthe data being delivered to the higher layer, the subsequent operationmay be performed.

Hereinafter, the above-described embodiments will be described in moredetail with reference to FIG. 1 to FIG. 19 .

FIG. 20 is a flowchart showing a procedure of performing allocation, bythe AP, by limiting RUs or MRUs for an STA operating only in a 20 MHzband according to the present embodiment.

The example of FIG. 20 may be performed in a network environment inwhich a next generation WLAN system (IEEE 802.11be or EHT WLAN system)is being supported. The next generation wireless LAN system is a WLANsystem that is enhanced from an 802.11ax system and may, therefore,satisfy backward compatibility with the 802.11ax system.

The example of FIG. 20 may be performed by a transmitting station (STA),and the transmitting STA may correspond to an access point (AP) STA. Areceiving STA of FIG. 20 may correspond to a non-AP STA that operatesonly in a 20 MHz band.

The present embodiment proposes a method for configuring RU and MRU thatcannot be allocated (that are limited (or restricted) for allocation) toan STA operating only in a 20 MHz band based on an 80 MHz band toneplan, which is newly defined in an 802.11 be WLAN system.

In step S2010, a transmitting STA generates a Physical Protocol DataUnit (PPDU).

In step S2020, the transmitting STA transmits the PPDU to a receivingSTA through a preset frequency band.

The receiving STA is an STA that operates only in a 20 MHz band.

The PPDU includes a preamble and a data field. And, the data field isreceived through resources other than a first resource unit (RU) and afirst multiple RUs (MRU) among the preset frequency band. The first MRUis newly defined in the 802.11be wireless LAN system as multiple RUshaving 2 RUs aggregated therein.

When the preset frequency band is a 40 MHz band, an RU layout (or toneplan) for the 40 MHz band is as described below. The tone plan for the40 MHz band is the same in both 802.11ax and 802.11be WLAN systems.

When the 40 MHz band consists of only 26 tone RUs, the 40 MHz bandincludes first to 18th 26 tone RUs. When the 40 MHz band consists ofonly 52 tone RUs, the 40 MHz band includes first to 8th 52 tone RUs.When the 40 MHz band consists of only 106 tone RUs, the 40 MHz bandincludes first to 4th 106 tone RUs. And, when the 40 MHz band consistsonly of 242 tone RUs, the 40 MHz band includes first and second 242 toneRUs.

At this point, the first to 18th 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency. The first to 8th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency. The first to 4th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency. And, the first and second 242 tone RUsmay be arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU includes the 5th and 14th 26 tone RUs and the first andsecond 242 tone RUs. That is, the 5th and 14th 26 tone RUs and the firstand second 242 tone RUs correspond to resources that are not allocatedto the receiving STA.

The first MRU includes an MRU in which the 5th 26 tone RU and the second52 tone RU are aggregated, an MRU in which the 14th 26 tone RU and the6th 52 tone RU are aggregated, an MRU in which the 5th 26 tone RU andthe first 106 tone RU are aggregated, an MRU in which the 5th 26 tone RUand the second 106 tone RU are aggregated, an MRU in which the 14th 26tone RU and the 3rd 106 tone RU are aggregated, and an MRU in which the14th 26 tone RU and the 4th 106 tone RU are aggregated. That is, themultiple RUs included in the first MRU also correspond to resources thatare not allocated to the receiving STA.

The present embodiment proposes a method according to which thereceiving STA is allocated only to remaining units (RUs) excluding thefirst RU and the first MRU, when the receiving STA receives an OFDMAPPDU through a 40 MHz band. Thus, the present disclosure may have a neweffect of being capable of preventing performance degradation andinterference of an adjacent channel from occurring by preventing datafrom being loaded on tones corresponding to DC tones and guard tones at20 MHz, where the receiving STA can be operated.

Additionally, when the receiving STA that operates only in a 20 MHz bandreceives an OFDMA PPDU through an 80 MHz band, a method of the receivingSTA being allocated only to resource units other than the first RU andthe first MRU may be proposed as described below.

When the preset frequency band is an 80 MHz band, a layout (or toneplan) of RUs for the 80 MHz band is as described below. Since the toneplan for the 80 MHz band that is proposed in the 802.11be WLAN systemand the tone plan for the 80 MHz band that is proposed in the 802.11axWLAN system are different, RU and MRU limitations need to be newly set(or configured).

When the 80 MHz band consists of only 26 tone RUs, the 80 MHz band mayinclude first to 36th 26 tone RUs. When the 80 MHz band consists of only52 tone RUs, the 80 MHz band may include first to 16th 52 tone RUs. Whenthe 80 MHz band consists of only 106 tone RUs, the 80 MHz band mayinclude first to 8th 106 tone RUs. And, when the 80 MHz band consistsonly of 242 tone RUs, the 80 MHz band may include first to 4th 242 toneRUs.

At this point, the first to 36th 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency, the first to 16th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency, the first to 8th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency, and the first to 4th 242 tone RUs maybe arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU may include the 5th, 14th, 23rd, and 32nd 26 tone RUs andthe first to 4th 242 tone RUs. That is, the 5th, 14th, 23rd, and 32nd 26tone RUs and the first to 4th 242 tone RUs correspond to resources thatare not allocated to the receiving STA.

The first MRU may include an MRU in which the 5th 26 tone RU and thesecond 52 tone RU are aggregated, an MRU in which the 14th 26 tone RUand the 6th 52 tone RU are aggregated, an MRU in which the 23rd 26 toneRU and the 10th 52 tone RU are aggregated, an MRU in which the 32nd 26tone RU and the 14th 52 tone RU are aggregated, an MRU in which the 5th26 tone RU and the first 106 tone RU are aggregated, an MRU in which the14th 26 tone RU and the 4th 106 tone RU are aggregated, an MRU in whichthe 23rd 26 tone RU and the 5th 106 tone RU are aggregated, and an MRUin which the 32nd 26 tone RU and the 8th 106 tone RU are aggregated.That is, the multiple RUs included in the first MRU also correspond toresources that are not allocated to the receiving STA.

Additionally, when the receiving STA that operates only in a 20 MHz bandreceives an OFDMA PPDU through a 160 MHz band, a method of the receivingSTA being allocated only to resource units other than the first RU andthe first MRU may be proposed as described below.

When the preset frequency band is a 160 MHz band, a layout (or toneplan) of RUs for the 160 MHz band is as described below. The tone planfor the 160 MHz band that is proposed in the 802.11be WLAN system is thesame as a tone plan repeating two times the tone plan for the 80 MHzband that is proposed in the 802.11be WLAN system. The 160 MHz band mayinclude first and second 80 MHz subchannels.

When the first 80 MHz subchannel consists of only 26 tone RUs, the first80 MHz subchannel may include first to 36th 26 tone RUs, when the first80 MHz subchannel consists of only 52 tone RUs, the first 80 MHzsubchannel may include first to 16th 52 tone RUs, when the first 80 MHzsubchannel consists of only 106 tone RUs, the first 80 MHz subchannelmay include first to 8th 106 tone RUs, and when the first 80 MHzsubchannel consists only of 242 tone RUs, the first 80 MHz subchannelmay include first to 4th 242 tone RUs.

When the second 80 MHz subchannel consists of only 26 tone RUs, thesecond 80 MHz subchannel may include 37th to 72nd 26 tone RUs, when thesecond 80 MHz subchannel consists of only 52 tone RUs, the second 80 MHzsubchannel may include 17th to 32nd 52 tone RUs, when the second 80 MHzsubchannel consists of only 106 tone RUs, the second 80 MHz subchannelmay include 9th to 16th 106 tone RUs, and when the second 80 MHzsubchannel consists only of 242 tone RUs, the second 80 MHz subchannelmay include 5th to 8th 242 tone RUs.

At this point, the first to 72nd 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency, the first to 36th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency, the first to 16th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency, and the first to 8th 242 tone RUs maybe arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU includes the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and68th 26 tone RUs and the first to 8th 242 tone RUs. That is, the 5th,14th, 23rd, 32nd, 41st, 50th, 59th, and 68th 26 tone RUs and the firstto 8th 242 tone RUs correspond to resources that are not allocated tothe receiving STA.

The first MRU may include an MRU in which the 5th 26 tone RU and thesecond 52 tone RU are aggregated, an MRU in which the 14th 26 tone RUand the 6th 52 tone RU are aggregated, an MRU in which the 23rd 26 toneRU and the 10th 52 tone RU are aggregated, an MRU in which the 32nd 26tone RU and the 14th 52 tone RU are aggregated, an MRU in which the 41st26 tone RU and the 18th 52 tone RU are aggregated, an MRU in which the50th 26 tone RU and the 22nd 52 tone RU are aggregated, an MRU in whichthe 59th 26 tone RU and the 26th 52 tone RU are aggregated, an MRU inwhich the 68th 26 tone RU and the 30th 52 tone RU are aggregated, an MRUin which the 5th 26 tone RU and the first 106 tone RU are aggregated, anMRU in which the 14th 26 tone RU and the 4th 106 tone RU are aggregated,an MRU in which the 23rd 26 tone RU and the 5th 106 tone RU areaggregated, and an MRU in which the 32nd 26 tone RU and the 8th 106 toneRU are aggregated, an MRU in which the 41st 26 tone RU and the 9th 106tone RU are aggregated, an MRU in which the 50th 26 tone RU and the 12th106 tone RU are aggregated, an MRU in which the 59th 26 tone RU and the13th 106 tone RU are aggregated, and an MRU in which the 68th 26 tone RUand the 16th 106 tone RU are aggregated. That is, the multiple RUsincluded in the first MRU also correspond to resources that are notallocated to the receiving STA.

Additionally, when the receiving STA that operates only in a 20 MHz bandreceives an OFDMA PPDU through a 320 MHz band, a method of the receivingSTA being allocated only to resource units other than the first RU andthe first MRU may be proposed as described below.

When the preset frequency band is a 320 MHz band, a layout (or toneplan) of RUs for the 320 MHz band is as described below. The tone planfor the 320 MHz band that is proposed in the 802.11be WLAN system is thesame as a tone plan repeating four times the tone plan for the 80 MHzband that is proposed in the 802.11be WLAN system. The 320 MHz band mayinclude first to 4th 80 MHz subchannels.

When the first 80 MHz subchannel consists of only 26 tone RUs, the first80 MHz subchannel may include first to 36th 26 tone RUs, when the first80 MHz subchannel consists of only 52 tone RUs, the first 80 MHzsubchannel may include first to 16th 52 tone RUs, when the first 80 MHzsubchannel consists of only 106 tone RUs, the first 80 MHz subchannelmay include first to 8th 106 tone RUs, and when the first 80 MHzsubchannel consists only of 242 tone RUs, the first 80 MHz subchannelmay include first to 4th 242 tone RUs.

When the second 80 MHz subchannel consists of only 26 tone RUs, thesecond 80 MHz subchannel may include 37th to 72nd 26 tone RUs, when thesecond 80 MHz subchannel consists of only 52 tone RUs, the second 80 MHzsubchannel may include 17th to 32nd 52 tone RUs, when the second 80 MHzsubchannel consists of only 106 tone RUs, the second 80 MHz subchannelmay include 9th to 16th 106 tone RUs, and when the second 80 MHzsubchannel consists only of 242 tone RUs, the second 80 MHz subchannelmay include 5th to 8th 242 tone RUs.

When the third 80 MHz subchannel consists of only 26 tone RUs, the third80 MHz subchannel may include 73rd to 108th 26 tone RUs, when the third80 MHz subchannel consists of only 52 tone RUs, the third 80 MHzsubchannel may include 33rd to 48th 52 tone RUs, when the third 80 MHzsubchannel consists of only 106 tone RUs, the third 80 MHz subchannelmay include 17th to 24th 106 tone RUs, and when the third 80 MHzsubchannel consists only of 242 tone RUs, the third 80 MHz subchannelmay include 9th to 12th 242 tone RUs.

When the fourth 80 MHz subchannel consists of only 26 tone RUs, thefourth 80 MHz subchannel may include 109th to 144th 26 tone RUs, whenthe fourth 80 MHz subchannel consists of only 52 tone RUs, the fourth 80MHz subchannel may include 49th to 64th 52 tone RUs, when the fourth 80MHz subchannel consists of only 106 tone RUs, the fourth 80 MHzsubchannel may include 25th to 32nd 106 tone RUs, and when the fourth 80MHz subchannel consists only of 242 tone RUs, the fourth 80 MHzsubchannel may include 13th to 16th 242 tone RUs.

At this point, the first to 144th 26 tone RUs may be arranged by anorder starting from a 26 tone RU having a low frequency to a 26 tone RUhaving a high frequency, the first to 64th 52 tone RUs may be arrangedby an order starting from a 52 tone RU having a low frequency to a 52tone RU having a high frequency, the first to 32nd 106 tone RUs may bearranged by an order starting from a 106 tone RU having a low frequencyto a 106 tone RU having a high frequency, and the first to 16th 242 toneRUs may be arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU may include the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th,68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th, 26 toneRUs and the first to 16th 242 tone RUs. That is, the 5th, 14th, 23rd,32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd,131st, and 140th, 26 tone RUs and the first to 16th 242 tone RUscorrespond to resources that are not allocated to the receiving STA.

The first MRU may include an MRU in which the 5th 26 tone RU and thesecond 52 tone RU are aggregated, an MRU in which the 14th 26 tone RUand the 6th 52 tone RU are aggregated, an MRU in which the 23rd 26 toneRU and the 10th 52 tone RU are aggregated, an MRU in which the 32nd 26tone RU and the 14th 52 tone RU are aggregated, an MRU in which the 41st26 tone RU and the 18th 52 tone RU are aggregated, an MRU in which the50th 26 tone RU and the 22nd 52 tone RU are aggregated, an MRU in whichthe 59th 26 tone RU and the 26th 52 tone RU are aggregated, an MRU inwhich the 68th 26 tone RU and the 30th 52 tone RU are aggregated, an MRUin which the 77th 26 tone RU and the 34th 52 tone RU are aggregated, anMRU in which the 86th 26 tone RU and the 38th 52 tone RU are aggregated,an MRU in which the 95th 26 tone RU and the 42nd 52 tone RU areaggregated, an MRU in which the 104th 26 tone RU and the 46th 52 tone RUare aggregated, an MRU in which the 113th 26 tone RU and the 50th 52tone RU are aggregated, an MRU in which the 122nd 26 tone RU and the54th 52 tone RU are aggregated, an MRU in which the 131st 26 tone RU andthe 58th 52 tone RU are aggregated, an MRU in which the 140th 26 tone RUand the 62nd 52 tone RU are aggregated, an MRU in which the 5th 26 toneRU and the first 106 tone RU are aggregated, an MRU in which the 14th 26tone RU and the 4th 106 tone RU are aggregated, an MRU in which the 23rd26 tone RU and the 5th 106 tone RU are aggregated, and an MRU in whichthe 32nd 26 tone RU and the 8th 106 tone RU are aggregated, an MRU inwhich the 41st 26 tone RU and the 9th 106 tone RU are aggregated, an MRUin which the 50th 26 tone RU and the 12th 106 tone RU are aggregated, anMRU in which the 59th 26 tone RU and the 13th 106 tone RU areaggregated, and an MRU in which the 68th 26 tone RU and the 16th 106tone RU are aggregated, an MRU in which the 77th 26 tone RU and the 17th106 tone RU are aggregated, an MRU in which the 86th 26 tone RU and the20th 106 tone RU are aggregated, an MRU in which the 95th 26 tone RU andthe 21st 106 tone RU are aggregated, an MRU in which the 104th 26 toneRU and the 24th 106 tone RU are aggregated, an MRU in which the 113th 26tone RU and the 25th 106 tone RU are aggregated, an MRU in which the122nd 26 tone RU and the 28th 106 tone RU are aggregated, an MRU inwhich the 131st 26 tone RU and the 29th 106 tone RU are aggregated, andan MRU in which the 140th 26 tone RU and the 32nd 106 tone RU areaggregated. That is, the multiple RUs included in the first MRU alsocorrespond to resources that are not allocated to the receiving STA.

The PPDU may be a DL OFDMA PPDU or UL OFDMA PPDU. When the PPDU is a DLOFDMA PPDU, the transmitting STA may transmit an Extremely HighThroughput (EHT) Multi User (MU) PPDU to the receiving STA, and thereceiving STA may decode the EHT MU PPDU through resources other thanthe first RU and the first MRU among the preset frequency band. And,when the PPDU is an Uplink (UL) OFDMA PPDU, the transmitting STA is anSTA that operates only in a 20 MHz band, and the transmitting STAreceives a trigger frame from the receiving STA (herein, the AP). And,the transmitting STA may transmit a Trigger Based (TB) PPDU to thereceiving STA. At this point, and the EHT TB PPDU may be transmittedthrough resources other than the first RU and the first MRU among thepreset frequency band. The EHT MU PPDU may include Legacy-Short TrainingField (L-STF), Legacy-Long Training Field (L-LTF), Legacy-Signal(L-SIG), Repeated L-SIG (RL-SIG), Universal-Signal (U-SIG), EHT-SIG,EHT-STF, and EHT-LTFs data fields. The EHT TB PPDU is defined as aformat excluding the EHT-SIG from the EHT MU PPDU.

Additionally, when the PPDU is a DL OFDMA PPDU, 242 tone RUs that areincluded in the preset frequency band may be optionally allocated. Forexample, when the PPDU is a DL OFDMA PPDU that is received through a 40MHz band, the first RU may optionally include the first and second 242tone RUs. That is, the transmitting STA may optionally allocate thefirst and second 242 RU tones to the receiving STA. If the first RUincludes only the first 242 tone RU and does not include the second 242tone RU, the receiving STA may receive the DL OFDMA PPDU through thesecond 242 tone RU (in case the receiving STA has capability for thesecond 242 tone RU). This may also be identically applied when thepreset frequency band is an 80 MHz, 160 MHz, 320 MHz band.

FIG. 21 is a flowchart showing a procedure of receiving allocation, byan STA operating only in a 20 MHz band, by limiting RUs or MRUsaccording to the present embodiment.

The example of FIG. 21 may be performed in a network environment inwhich a next generation WLAN system is being supported. The nextgeneration wireless LAN system is a WLAN system that is enhanced from an802.11 ax system and may, therefore, satisfy backward compatibility withthe 802.11ax system.

The example of FIG. 21 may be performed by a receiving station (STA),and the receiving STA may correspond to a non-AP STA operating only in a20 MHz band. A transmitting STA of FIG. 21 may correspond to an accesspoint (AP) STA.

The present embodiment proposes a method for configuring RU and MRU thatcannot be allocated (that are limited (or restricted) for allocation) toan STA operating only in a 20 MHz band based on an 80 MHz band toneplan, which is newly defined in an 802.11be WLAN system.

In step S2110, a receiving station (STA) receives a Physical ProtocolData Unit (PPDU) from a transmitting STA through a preset frequencyband.

In step S2120, the receiving STA decodes the PPDU.

The receiving STA is an STA that operates only in a 20 MHz band.

The PPDU includes a preamble and a data field. And, the data field isreceived through resources other than a first resource unit (RU) and afirst multiple RUs (MRU) among the preset frequency band. The first MRUis newly defined in the 802.11be wireless LAN system as multiple RUshaving 2 RUs aggregated therein.

When the preset frequency band is a 40 MHz band, an RU layout (or toneplan) for the 40 MHz band is as described below. The tone plan for the40 MHz band is the same in both 802.11ax and 802.11be WLAN systems.

When the 40 MHz band consists of only 26 tone RUs, the 40 MHz bandincludes first to 18th 26 tone RUs. When the 40 MHz band consists ofonly 52 tone RUs, the 40 MHz band includes first to 8th 52 tone RUs.When the 40 MHz band consists of only 106 tone RUs, the 40 MHz bandincludes first to 4th 106 tone RUs. And, when the 40 MHz band consistsonly of 242 tone RUs, the 40 MHz band includes first and second 242 toneRUs.

At this point, the first to 18th 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency. The first to 8th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency. The first to 4th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency. And, the first and second 242 tone RUsmay be arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU includes the 5th and 14th 26 tone RUs and the first andsecond 242 tone RUs. That is, the 5th and 14th 26 tone RUs and the firstand second 242 tone RUs correspond to resources that are not allocatedto the receiving STA.

The first MRU includes an MRU in which the 5th 26 tone RU and the second52 tone RU are aggregated, an MRU in which the 14th 26 tone RU and the6th 52 tone RU are aggregated, an MRU in which the 5th 26 tone RU andthe first 106 tone RU are aggregated, an MRU in which the 5th 26 tone RUand the second 106 tone RU are aggregated, an MRU in which the 14th 26tone RU and the 3rd 106 tone RU are aggregated, and an MRU in which the14th 26 tone RU and the 4th 106 tone RU are aggregated. That is, themultiple RUs included in the first MRU also correspond to resources thatare not allocated to the receiving STA.

The present embodiment proposes a method according to which thereceiving STA is allocated only to remaining units (RUs) excluding thefirst RU and the first MRU, when the receiving STA receives an OFDMAPPDU through a 40 MHz band. Thus, the present disclosure may have a neweffect of being capable of preventing performance degradation andinterference of an adjacent channel from occurring by preventing datafrom being loaded on tones corresponding to DC tones and guard tones at20 MHz, where the receiving STA can be operated.

Additionally, when the receiving STA that operates only in a 20 MHz bandreceives an OFDMA PPDU through an 80 MHz band, a method of the receivingSTA being allocated only to resource units other than the first RU andthe first MRU may be proposed as described below.

When the preset frequency band is an 80 MHz band, a layout (or toneplan) of RUs for the 80 MHz band is as described below. Since the toneplan for the 80 MHz band that is proposed in the 802.11be WLAN systemand the tone plan for the 80 MHz band that is proposed in the 802.11axWLAN system are different, RU and MRU limitations need to be newly set(or configured).

When the 80 MHz band consists of only 26 tone RUs, the 80 MHz band mayinclude first to 36th 26 tone RUs. When the 80 MHz band consists of only52 tone RUs, the 80 MHz band may include first to 16th 52 tone RUs. Whenthe 80 MHz band consists of only 106 tone RUs, the 80 MHz band mayinclude first to 8th 106 tone RUs. And, when the 80 MHz band consistsonly of 242 tone RUs, the 80 MHz band may include first to 4th 242 toneRUs.

At this point, the first to 36th 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency, the first to 16th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency, the first to 8th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency, and the first to 4th 242 tone RUs maybe arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU may include the 5th, 14th, 23rd, and 32nd 26 tone RUs andthe first to 4th 242 tone RUs. That is, the 5th, 14th, 23rd, and 32nd 26tone RUs and the first to 4th 242 tone RUs correspond to resources thatare not allocated to the receiving STA.

The first MRU may include an MRU in which the 5th 26 tone RU and thesecond 52 tone RU are aggregated, an MRU in which the 14th 26 tone RUand the 6th 52 tone RU are aggregated, an MRU in which the 23rd 26 toneRU and the 10th 52 tone RU are aggregated, an MRU in which the 32nd 26tone RU and the 14th 52 tone RU are aggregated, an MRU in which the 5th26 tone RU and the first 106 tone RU are aggregated, an MRU in which the14th 26 tone RU and the 4th 106 tone RU are aggregated, an MRU in whichthe 23rd 26 tone RU and the 5th 106 tone RU are aggregated, and an MRUin which the 32nd 26 tone RU and the 8th 106 tone RU are aggregated.That is, the multiple RUs included in the first MRU also correspond toresources that are not allocated to the receiving STA.

Additionally, when the receiving STA that operates only in a 20 MHz bandreceives an OFDMA PPDU through a 160 MHz band, a method of the receivingSTA being allocated only to resource units other than the first RU andthe first MRU may be proposed as described below.

When the preset frequency band is a 160 MHz band, a layout (or toneplan) of RUs for the 160 MHz band is as described below. The tone planfor the 160 MHz band that is proposed in the 802.11be WLAN system is thesame as a tone plan repeating two times the tone plan for the 80 MHzband that is proposed in the 802.11be WLAN system. The 160 MHz band mayinclude first and second 80 MHz subchannels.

When the first 80 MHz subchannel consists of only 26 tone RUs, the first80 MHz subchannel may include first to 36th 26 tone RUs, when the first80 MHz subchannel consists of only 52 tone RUs, the first 80 MHzsubchannel may include first to 16th 52 tone RUs, when the first 80 MHzsubchannel consists of only 106 tone RUs, the first 80 MHz subchannelmay include first to 8th 106 tone RUs, and when the first 80 MHzsubchannel consists only of 242 tone RUs, the first 80 MHz subchannelmay include first to 4th 242 tone RUs.

When the second 80 MHz subchannel consists of only 26 tone RUs, thesecond 80 MHz subchannel may include 37th to 72nd 26 tone RUs, when thesecond 80 MHz subchannel consists of only 52 tone RUs, the second 80 MHzsubchannel may include 17th to 32nd 52 tone RUs, when the second 80 MHzsubchannel consists of only 106 tone RUs, the second 80 MHz subchannelmay include 9th to 16th 106 tone RUs, and when the second 80 MHzsubchannel consists only of 242 tone RUs, the second 80 MHz subchannelmay include 5th to 8th 242 tone RUs.

At this point, the first to 72nd 26 tone RUs may be arranged by an orderstarting from a 26 tone RU having a low frequency to a 26 tone RU havinga high frequency, the first to 36th 52 tone RUs may be arranged by anorder starting from a 52 tone RU having a low frequency to a 52 tone RUhaving a high frequency, the first to 16th 106 tone RUs may be arrangedby an order starting from a 106 tone RU having a low frequency to a 106tone RU having a high frequency, and the first to 8th 242 tone RUs maybe arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU includes the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th, and68th 26 tone RUs and the first to 8th 242 tone RUs. That is, the 5th,14th, 23rd, 32nd, 41st, 50th, 59th, and 68th 26 tone RUs and the firstto 8th 242 tone RUs correspond to resources that are not allocated tothe receiving STA.

The first MRU may include an MRU in which the 5th 26 tone RU and thesecond 52 tone RU are aggregated, an MRU in which the 14th 26 tone RUand the 6th 52 tone RU are aggregated, an MRU in which the 23rd 26 toneRU and the 10th 52 tone RU are aggregated, an MRU in which the 32nd 26tone RU and the 14th 52 tone RU are aggregated, an MRU in which the 41st26 tone RU and the 18th 52 tone RU are aggregated, an MRU in which the50th 26 tone RU and the 22nd 52 tone RU are aggregated, an MRU in whichthe 59th 26 tone RU and the 26th 52 tone RU are aggregated, an MRU inwhich the 68th 26 tone RU and the 30th 52 tone RU are aggregated, an MRUin which the 5th 26 tone RU and the first 106 tone RU are aggregated, anMRU in which the 14th 26 tone RU and the 4th 106 tone RU are aggregated,an MRU in which the 23rd 26 tone RU and the 5th 106 tone RU areaggregated, and an MRU in which the 32nd 26 tone RU and the 8th 106 toneRU are aggregated, an MRU in which the 41st 26 tone RU and the 9th 106tone RU are aggregated, an MRU in which the 50th 26 tone RU and the 12th106 tone RU are aggregated, an MRU in which the 59th 26 tone RU and the13th 106 tone RU are aggregated, and an MRU in which the 68th 26 tone RUand the 16th 106 tone RU are aggregated. That is, the multiple RUsincluded in the first MRU also correspond to resources that are notallocated to the receiving STA.

Additionally, when the receiving STA that operates only in a 20 MHz bandreceives an OFDMA PPDU through a 320 MHz band, a method of the receivingSTA being allocated only to resource units other than the first RU andthe first MRU may be proposed as described below.

When the preset frequency band is a 320 MHz band, a layout (or toneplan) of RUs for the 320 MHz band is as described below. The tone planfor the 320 MHz band that is proposed in the 802.11be WLAN system is thesame as a tone plan repeating four times the tone plan for the 80 MHzband that is proposed in the 802.11be WLAN system. The 320 MHz band mayinclude first to 4th 80 MHz subchannels.

When the first 80 MHz subchannel consists of only 26 tone RUs, the first80 MHz subchannel may include first to 36th 26 tone RUs, when the first80 MHz subchannel consists of only 52 tone RUs, the first 80 MHzsubchannel may include first to 16th 52 tone RUs, when the first 80 MHzsubchannel consists of only 106 tone RUs, the first 80 MHz subchannelmay include first to 8th 106 tone RUs, and when the first 80 MHzsubchannel consists only of 242 tone RUs, the first 80 MHz subchannelmay include first to 4th 242 tone RUs.

When the second 80 MHz subchannel consists of only 26 tone RUs, thesecond 80 MHz subchannel may include 37th to 72nd 26 tone RUs, when thesecond 80 MHz subchannel consists of only 52 tone RUs, the second 80 MHzsubchannel may include 17th to 32nd 52 tone RUs, when the second 80 MHzsubchannel consists of only 106 tone RUs, the second 80 MHz subchannelmay include 9th to 16th 106 tone RUs, and when the second 80 MHzsubchannel consists only of 242 tone RUs, the second 80 MHz subchannelmay include 5th to 8th 242 tone RUs.

When the third 80 MHz subchannel consists of only 26 tone RUs, the third80 MHz subchannel may include 73rd to 108th 26 tone RUs, when the third80 MHz subchannel consists of only 52 tone RUs, the third 80 MHzsubchannel may include 33rd to 48th 52 tone RUs, when the third 80 MHzsubchannel consists of only 106 tone RUs, the third 80 MHz subchannelmay include 17th to 24th 106 tone RUs, and when the third 80 MHzsubchannel consists only of 242 tone RUs, the third 80 MHz subchannelmay include 9th to 12th 242 tone RUs.

When the fourth 80 MHz subchannel consists of only 26 tone RUs, thefourth 80 MHz subchannel may include 109th to 144th 26 tone RUs, whenthe fourth 80 MHz subchannel consists of only 52 tone RUs, the fourth 80MHz subchannel may include 49th to 64th 52 tone RUs, when the fourth 80MHz subchannel consists of only 106 tone RUs, the fourth 80 MHzsubchannel may include 25th to 32nd 106 tone RUs, and when the fourth 80MHz subchannel consists only of 242 tone RUs, the fourth 80 MHzsubchannel may include 13th to 16th 242 tone RUs.

At this point, the first to 144th 26 tone RUs may be arranged by anorder starting from a 26 tone RU having a low frequency to a 26 tone RUhaving a high frequency, the first to 64th 52 tone RUs may be arrangedby an order starting from a 52 tone RU having a low frequency to a 52tone RU having a high frequency, the first to 32nd 106 tone RUs may bearranged by an order starting from a 106 tone RU having a low frequencyto a 106 tone RU having a high frequency, and the first to 16th 242 toneRUs may be arranged by an order starting from a 242 tone RU having a lowfrequency to a 242 tone RU having a high frequency.

The first RU may include the 5th, 14th, 23rd, 32nd, 41st, 50th, 59th,68th, 77th, 86th, 95th, 104th, 113th, 122nd, 131st, and 140th, 26 toneRUs and the first to 16th 242 tone RUs. That is, the 5th, 14th, 23rd,32nd, 41st, 50th, 59th, 68th, 77th, 86th, 95th, 104th, 113th, 122nd,131st, and 140th, 26 tone RUs and the first to 16th 242 tone RUscorrespond to resources that are not allocated to the receiving STA.

The first MRU may include an MRU in which the 5th 26 tone RU and thesecond 52 tone RU are aggregated, an MRU in which the 14th 26 tone RUand the 6th 52 tone RU are aggregated, an MRU in which the 23rd 26 toneRU and the 10th 52 tone RU are aggregated, an MRU in which the 32nd 26tone RU and the 14th 52 tone RU are aggregated, an MRU in which the 41st26 tone RU and the 18th 52 tone RU are aggregated, an MRU in which the50th 26 tone RU and the 22nd 52 tone RU are aggregated, an MRU in whichthe 59th 26 tone RU and the 26th 52 tone RU are aggregated, an MRU inwhich the 68th 26 tone RU and the 30th 52 tone RU are aggregated, an MRUin which the 77th 26 tone RU and the 34th 52 tone RU are aggregated, anMRU in which the 86th 26 tone RU and the 38th 52 tone RU are aggregated,an MRU in which the 95th 26 tone RU and the 42nd 52 tone RU areaggregated, an MRU in which the 104th 26 tone RU and the 46th 52 tone RUare aggregated, an MRU in which the 113th 26 tone RU and the 50th 52tone RU are aggregated, an MRU in which the 122nd 26 tone RU and the54th 52 tone RU are aggregated, an MRU in which the 131st 26 tone RU andthe 58th 52 tone RU are aggregated, an MRU in which the 140th 26 tone RUand the 62nd 52 tone RU are aggregated, an MRU in which the 5th 26 toneRU and the first 106 tone RU are aggregated, an MRU in which the 14th 26tone RU and the 4th 106 tone RU are aggregated, an MRU in which the 23rd26 tone RU and the 5th 106 tone RU are aggregated, and an MRU in whichthe 32nd 26 tone RU and the 8th 106 tone RU are aggregated, an MRU inwhich the 41st 26 tone RU and the 9th 106 tone RU are aggregated, an MRUin which the 50th 26 tone RU and the 12th 106 tone RU are aggregated, anMRU in which the 59th 26 tone RU and the 13th 106 tone RU areaggregated, and an MRU in which the 68th 26 tone RU and the 16th 106tone RU are aggregated, an MRU in which the 77th 26 tone RU and the 17th106 tone RU are aggregated, an MRU in which the 86th 26 tone RU and the20th 106 tone RU are aggregated, an MRU in which the 95th 26 tone RU andthe 21st 106 tone RU are aggregated, an MRU in which the 104th 26 toneRU and the 24th 106 tone RU are aggregated, an MRU in which the 113th 26tone RU and the 25th 106 tone RU are aggregated, an MRU in which the122nd 26 tone RU and the 28th 106 tone RU are aggregated, an MRU inwhich the 131st 26 tone RU and the 29th 106 tone RU are aggregated, andan MRU in which the 140th 26 tone RU and the 32nd 106 tone RU areaggregated. That is, the multiple RUs included in the first MRU alsocorrespond to resources that are not allocated to the receiving STA.

The PPDU may be a DL OFDMA PPDU or UL OFDMA PPDU. When the PPDU is a DLOFDMA PPDU, the transmitting STA may transmit an Extremely HighThroughput (EHT) Multi User (MU) PPDU to the receiving STA, and thereceiving STA may decode the EHT MU PPDU through resources other thanthe first RU and the first MRU among the preset frequency band. And,when the PPDU is an Uplink (UL) OFDMA PPDU, the transmitting STA is anSTA that operates only in a 20 MHz band, and the transmitting STAreceives a trigger frame from the receiving STA (herein, the AP). And,the transmitting STA may transmit a Trigger Based (TB) PPDU to thereceiving STA. At this point, and the EHT TB PPDU may be transmittedthrough resources other than the first RU and the first MRU among thepreset frequency band. The EHT MU PPDU may include Legacy-Short TrainingField (L-STF), Legacy-Long Training Field (L-LTF), Legacy-Signal(L-SIG), Repeated L-SIG (RL-SIG), Universal-Signal (U-SIG), EHT-SIG,EHT-STF, and EHT-LTFs data fields. The EHT TB PPDU is defined as aformat excluding the EHT-SIG from the EHT MU PPDU.

Additionally, when the PPDU is a DL OFDMA PPDU, 242 tone RUs that areincluded in the preset frequency band may be optionally allocated. Forexample, when the PPDU is a DL OFDMA PPDU that is received through a 40MHz band, the first RU may optionally include the first and second 242tone RUs. That is, the transmitting STA may optionally allocate thefirst and second 242 RU tones to the receiving STA. If the first RUincludes only the first 242 tone RU and does not include the second 242tone RU, the receiving STA may receive the DL OFDMA PPDU through thesecond 242 tone RU (in case the receiving STA has capability for thesecond 242 tone RU). This may also be identically applied when thepreset frequency band is an 80 MHz, 160 MHz, 320 MHz band.

4. Device Configuration

The above-described technical features of the present specification maybe applied to various device and methods. For example, theabove-described technical features of the present specification may beperformed/supported through FIG. 1 and/or FIG. 11 . For example, theabove-described technical features of the present specification may beapplied to only part of FIG. 1 and/or FIG. 11 . For example, theabove-described technical features of the present specification may beimplemented based on the processing chip(s) 114 and 124 of FIG. 1 , orimplemented based on the processor(s) 111 and 121 and the memory(s) 112and 122, or implemented based on the processor 610 and the memory 620 ofFIG. 11 . For example, the device of the present specification receivesa Physical Protocol Data Unit (PPDU) from a transmitting station (STA)through a preset frequency band, and decodes the PPDU.

The technical features of the present specification may be implementedbased on a computer readable medium (CRM). For example, the CRM that isproposed in the present specification is a computer readable mediumincluding an instruction being executed by at least one processor.

The CRM may store instructions performing operations including receivinga Physical Protocol Data Unit (PPDU) from a transmitting station (STA)through a preset frequency band, and decoding the PPDU. The instructionsthat are stored in the CRM of the present specification may be executedby at least one processor. At least one processor being related to theCRM of the present specification may be the processor(s) 111 and 121 orprocessing chip(s) 114 and 124 of FIG. 1 , or the processor 610 of FIG.11 . Meanwhile, the CRM of the present specification may be thememory(s) 112 and 122 of FIG. 1 , or the memory 620 of FIG. 11 , or aseparate external memory/storage medium/disc, and so on.

The foregoing technical features of this specification are applicable tovarious applications or business models. For example, the foregoingtechnical features may be applied for wireless communication of a devicesupporting artificial intelligence (AI).

Artificial intelligence refers to a field of study on artificialintelligence or methodologies for creating artificial intelligence, andmachine learning refers to a field of study on methodologies fordefining and solving various issues in the area of artificialintelligence. Machine learning is also defined as an algorithm forimproving the performance of an operation through steady experiences ofthe operation.

An artificial neural network (ANN) is a model used in machine learningand may refer to an overall problem-solving model that includesartificial neurons (nodes) forming a network by combining synapses. Theartificial neural network may be defined by a pattern of connectionbetween neurons of different layers, a learning process of updating amodel parameter, and an activation function generating an output value.

The artificial neural network may include an input layer, an outputlayer, and optionally one or more hidden layers. Each layer includes oneor more neurons, and the artificial neural network may include synapsesthat connect neurons. In the artificial neural network, each neuron mayoutput a function value of an activation function of input signals inputthrough a synapse, weights, and deviations.

A model parameter refers to a parameter determined through learning andincludes a weight of synapse connection and a deviation of a neuron. Ahyper-parameter refers to a parameter to be set before learning in amachine learning algorithm and includes a learning rate, the number ofiterations, a mini-batch size, and an initialization function.

Learning an artificial neural network may be intended to determine amodel parameter for minimizing a loss function. The loss function may beused as an index for determining an optimal model parameter in a processof learning the artificial neural network.

Machine learning may be classified into supervised learning,unsupervised learning, and reinforcement learning.

Supervised learning refers to a method of training an artificial neuralnetwork with a label given for training data, wherein the label mayindicate a correct answer (or result value) that the artificial neuralnetwork needs to infer when the training data is input to the artificialneural network. Unsupervised learning may refer to a method of trainingan artificial neural network without a label given for training data.Reinforcement learning may refer to a training method for training anagent defined in an environment to choose an action or a sequence ofactions to maximize a cumulative reward in each state.

Machine learning implemented with a deep neural network (DNN) includinga plurality of hidden layers among artificial neural networks isreferred to as deep learning, and deep learning is part of machinelearning. Hereinafter, machine learning is construed as including deeplearning.

The foregoing technical features may be applied to wirelesscommunication of a robot.

Robots may refer to machinery that automatically process or operate agiven task with own ability thereof. In particular, a robot having afunction of recognizing an environment and autonomously making ajudgment to perform an operation may be referred to as an intelligentrobot.

Robots may be classified into industrial, medical, household, militaryrobots and the like according uses or fields. A robot may include anactuator or a driver including a motor to perform various physicaloperations, such as moving a robot joint. In addition, a movable robotmay include a wheel, a brake, a propeller, and the like in a driver torun on the ground or fly in the air through the driver.

The foregoing technical features may be applied to a device supportingextended reality.

Extended reality collectively refers to virtual reality (VR), augmentedreality (AR), and mixed reality (MR). VR technology is a computergraphic technology of providing a real-world object and background onlyin a CG image, AR technology is a computer graphic technology ofproviding a virtual CG image on a real object image, and MR technologyis a computer graphic technology of providing virtual objects mixed andcombined with the real world.

MR technology is similar to AR technology in that a real object and avirtual object are displayed together. However, a virtual object is usedas a supplement to a real object in AR technology, whereas a virtualobject and a real object are used as equal statuses in MR technology.

XR technology may be applied to a head-mount display (HMD), a head-updisplay (HUD), a mobile phone, a tablet PC, a laptop computer, a desktopcomputer, a TV, digital signage, and the like. A device to which XRtechnology is applied may be referred to as an XR device.

Claims disclosed in the present specification can be combined in variousways. For example, technical features in method claims of the presentspecification can be combined to be implemented or performed in anapparatus, and technical features in apparatus claims of the presentspecification can be combined to be implemented or performed in amethod. Further, technical features in method claims and apparatusclaims of the present specification can be combined to be implemented orperformed in an apparatus. Further, technical features in method claimsand apparatus claims of the present specification can be combined to beimplemented or performed in a method.

What is claimed is:
 1. A method in a wireless local area network (WLAN)system, the method comprising: receiving, by a receiving station (STA),a Physical Protocol Data Unit (PPDU) from a transmitting STA; anddecoding, by the receiving STA, the PPDU, wherein the receiving STA is a20 MHz operating non-AP STA, wherein the 20 MHz operating non-AP STAdoes not support a first multiple-resource unit (MRU), wherein, based ona bandwidth of the PPDU being 40 MHz, the bandwidth of the PPDUcomprises first to 18th 26-tone RUs, first to 8th 52-tone RUs, first to4th 106-tone RUs, or first and second 242-tone RUs, wherein the firstMRU includes an MRU in which the second 52-tone RU and the 5th 26-toneRU are aggregated, an MRU in which the 6th 52-tone RU and the 14th26-tone RU are aggregated, an MRU in which the first 106-tone RU and 5th26-tone RU are aggregated, an MRU in which the second 106-tone RU andthe 5th 26-tone RU are aggregated, an MRU in which the 3rd 106-tone RUand the 14th 26-tone RU are aggregated, and an MRU in which the 4th106-tone RU and the 14th 26-tone RU are aggregated.
 2. The method ofclaim 1, wherein the first to 18th 26-tone RUs are arranged by an orderstarting from a 26-tone RU having a low frequency to a 26-tone RU havinga high frequency, wherein the first to 8th 52-tone RUs are arranged byan order starting from a 52-tone RU having a low frequency to a 52-toneRU having a high frequency, wherein the first to 4th 106-tone RUs arearranged by an order starting from a 106-tone RU having a low frequencyto a 106-tone RU having a high frequency, and wherein the first andsecond 242-tone RUs are arranged by an order starting from a 242-tone RUhaving a low frequency to a 242-tone RU having a high frequency.
 3. Themethod of claim 1, wherein, based on the bandwidth of the PPDU being 80MHz comprises first to 36th 26-tone RUs, first to 16th 52-tone RUs,first to 8th 106-tone RUs, or first to 4th 242-tone RUs, wherein thefirst MRU includes an MRU in which the 5th 26-tone RU and the second52-tone RU are aggregated, an MRU in which the 14th 26-tone RU and the6th 52-tone RU are aggregated, an MRU in which the 23rd 26-tone RU andthe 10th 52-tone RU are aggregated, an MRU in which the 32nd 26-tone RUand the 14th 52-tone RU are aggregated, an MRU in which the 5th 26-toneRU and the first 106-tone RU are aggregated, an MRU in which the 14th26-tone RU and the 4th 106-tone RU are aggregated, an MRU in which the23rd 26-tone RU and the 5th 106-tone RU are aggregated, and an MRU inwhich the 32nd 26-tone RU and the 8th 106-tone RU are aggregated.
 4. Themethod of claim 3, wherein the first to 36th 26-tone RUs are arranged byan order starting from a 26-tone RU having a low frequency to a 26-toneRU having a high frequency, wherein the first to 16th 52-tone RUs arearranged by an order starting from a 52-tone RU having a low frequencyto a 52-tone RU having a high frequency, wherein the first to 8th106-tone RUs are arranged by an order starting from a 106-tone RU havinga low frequency to a 106-tone RU having a high frequency, and whereinthe first to 4th 242-tone RUs are arranged by an order starting from a242-tone RU having a low frequency to a 242-tone RU having a highfrequency.
 5. The method of claim 1, wherein, based on the bandwidth ofthe PPDU being 160 MHz including first and second 80 MHz subchannels,wherein the first 80 MHz subchannel includes first to 36th 26-tone RUs,first to 16th 52-tone RUs, first to 8th 106-tone RUs, or first to 4th242-tone RUs, and when the second 80 MHz subchannel includes 37th to72nd 26-tone RUs, 17th to 32nd 52-tone RUs, 9th to 16th 106-tone RUs, or5th to 8th 242-tone RUs.
 6. The method of claim 5, wherein the first MRUincludes: an MRU in which the 5th 26-tone RU and the second 52-tone RUare aggregated, an MRU in which the 14th 26-tone RU and the 6th 52-toneRU are aggregated, an MRU in which the 23rd 26-tone RU and the 10th52-tone RU are aggregated, an MRU in which the 32nd 26-tone RU and the14th 52-tone RU are aggregated, an MRU in which the 41st 26-tone RU andthe 18th 52-tone RU are aggregated, an MRU in which the 50th 26-tone RUand the 22nd 52-tone RU are aggregated, an MRU in which the 59th 26-toneRU and the 26th 52-tone RU are aggregated, an MRU in which the 68th26-tone RU and the 30th 52-tone RU are aggregated, an MRU in which the5th 26-tone RU and the first 106-tone RU are aggregated, an MRU in whichthe 14th 26-tone RU and the 4th 106-tone RU are aggregated, an MRU inwhich the 23rd 26-tone RU and the 5th 106-tone RU are aggregated, and anMRU in which the 32nd 26-tone RU and the 8th 106-tone RU are aggregated,an MRU in which the 41st 26-tone RU and the 9th 106-tone RU areaggregated, an MRU in which the 50th 26-tone RU and the 12th 106-tone RUare aggregated, an MRU in which the 59th 26-tone RU and the 13th106-tone RU are aggregated, and an MRU in which the 68th 26-tone RU andthe 16th 106-tone RU are aggregated.
 7. The method of claim 6, whereinthe first to 72nd 26-tone RUs are arranged by an order starting from a26-tone RU having a low frequency to a 26-tone RU having a highfrequency, wherein the first to 36th 52-tone RUs are arranged by anorder starting from a 52-tone RU having a low frequency to a 52-tone RUhaving a high frequency, wherein the first to 16th 106-tone RUs arearranged by an order starting from a 106-tone RU having a low frequencyto a 106-tone RU having a high frequency, and wherein the first to 8th242-tone RUs are arranged by an order starting from a 242-tone RU havinga low frequency to a 242-tone RU having a high frequency.
 8. The methodof claim 1, wherein, based on the bandwidth of the PPDU being 320 MHzincluding first to 4th 80 MHz subchannels, wherein the first 80 MHzsubchannel includes first to 36th 26-tone RUs, first to 16th 52-toneRUs, first to 8th 106-tone RUs, or first to 4th 242-tone RUs, when thesecond 80 MHz subchannel includes 37th to 72nd 26-tone RUs, 17th to 32nd52-tone RUs, 9th to 16th 106-tone RUs, or 5th to 8th 242-tone RUs, whenthe third 80 MHz subchannel includes 73rd to 108th 26-tone RUs, 33rd to48th 52-tone RUs, 17th to 24th 106-tone RUs, or 9th to 12th 242-toneRUs, and when the fourth 80 MHz subchannel includes 109th to 144th26-tone RUs, 49th to 64th 52-tone RUs, 25th to 32nd 106-tone RUs, or13th to 16th 242-tone RUs.
 9. The method of claim 8, wherein the firstMRU includes: an MRU in which the 5th 26-tone RU and the second 52-toneRU are aggregated, an MRU in which the 14th 26-tone RU and the 6th52-tone RU are aggregated, an MRU in which the 23rd 26-tone RU and the10th 52-tone RU are aggregated, an MRU in which the 32nd 26-tone RU andthe 14th 52-tone RU are aggregated, an MRU in which the 41st 26-tone RUand the 18th 52-tone RU are aggregated, an MRU in which the 50th 26-toneRU and the 22nd 52-tone RU are aggregated, an MRU in which the 59th26-tone RU and the 26th 52-tone RU are aggregated, an MRU in which the68th 26-tone RU and the 30th 52-tone RU are aggregated, an MRU in whichthe 77th 26-tone RU and the 34th 52-tone RU are aggregated, an MRU inwhich the 86th 26-tone RU and the 38th 52-tone RU are aggregated, an MRUin which the 95th 26-tone RU and the 42nd 52-tone RU are aggregated, anMRU in which the 104th 26-tone RU and the 46th 52-tone RU areaggregated, an MRU in which the 113th 26-tone RU and the 50th 52-tone RUare aggregated, an MRU in which the 122nd 26-tone RU and the 54th52-tone RU are aggregated, an MRU in which the 131st 26-tone RU and the58th 52-tone RU are aggregated, an MRU in which the 140th 26-tone RU andthe 62nd 52-tone RU are aggregated, an MRU in which the 5th 26-tone RUand the first 106-tone RU are aggregated, an MRU in which the 14th26-tone RU and the 4th 106-tone RU are aggregated, an MRU in which the23rd 26-tone RU and the 5th 106-tone RU are aggregated, and an MRU inwhich the 32nd 26-tone RU and the 8th 106-tone RU are aggregated, an MRUin which the 41st 26-tone RU and the 9th 106-tone RU are aggregated, anMRU in which the 50th 26-tone RU and the 12th 106-tone RU areaggregated, an MRU in which the 59th 26-tone RU and the 13th 106-tone RUare aggregated, and an MRU in which the 68th 26-tone RU and the 16th106-tone RU are aggregated, an MRU in which the 77th 26-tone RU and the17th 106-tone RU are aggregated, an MRU in which the 86th 26-tone RU andthe 20th 106-tone RU are aggregated, an MRU in which the 95th 26-tone RUand the 21st 106-tone RU are aggregated, an MRU in which the 104th26-tone RU and the 24th 106-tone RU are aggregated, an MRU in which the113th 26-tone RU and the 25th 106-tone RU are aggregated, an MRU inwhich the 122nd 26-tone RU and the 28th 106-tone RU are aggregated, anMRU in which the 131st 26-tone RU and the 29th 106-tone RU areaggregated, and an MRU in which the 140th 26-tone RU and the 32nd106-tone RU are aggregated.
 10. The method of claim 9, wherein the firstto 144th 26-tone RUs are arranged by an order starting from a 26-tone RUhaving a low frequency to a 26-tone RU having a high frequency, whereinthe first to 64th 52-tone RUs are arranged by an order starting from a52-tone RU having a low frequency to a 52-tone RU having a highfrequency, wherein the first to 32nd 106-tone RUs are arranged by anorder starting from a 106-tone RU having a low frequency to a 106-toneRU having a high frequency, and wherein the first to 16th 242-tone RUsare arranged by an order starting from a 242-tone RU having a lowfrequency to a 242-tone RU having a high frequency.
 11. The method ofclaim 1, wherein, when the PPDU is a Downlink (DL) Orthogonal FrequencyDivision Multiple Access (OFDMA) PPDU, the PPDU is an Extremely HighThroughput (EHT) Multi User (MU) PPDU, and the EHT MU PPDU is decoded bythe receiving STA through resources other than the first MRU, andwherein, when the PPDU is an Uplink (UL) OFDMA PPDU, the PPDU is aTrigger Based (TB) PPDU, and the EHT TB PPDU is transmitted by thetransmitting STA through resources other than the first MRU.
 12. Areceiving station (STA) in a wireless local area network (WLAN) system,the receiving STA comprising: a memory; a transceiver; and a processorbeing operatively connected to the memory and the transceiver, whereinthe processor is configured to: receive a Physical Protocol Data Unit(PPDU) from a transmitting STA, and decode the PPDU, wherein thereceiving STA is a 20 MHz operating non-AP STA, wherein the 20 MHzoperating non-AP STA does not support a first multiple-resource unit(MRU), wherein, based on a bandwidth of the PPDU being 40 MHz, thebandwidth of the PPDU comprises first to 18th 26-tone RUs, first to 8th52-tone RUs, first to 4th 106-tone RUs, or first and second 242-toneRUs, wherein the first MRU includes an MRU in which the second 52-toneRU and the 5th 26-tone RU are aggregated, an MRU in which the 6th52-tone RU and the 14th 26-tone RU are aggregated, an MRU in which thefirst 106-tone RU and 5th 26-tone RU are aggregated, an MRU in which thesecond 106-tone RU and the 5th 26-tone RU are aggregated, an MRU inwhich the 3rd 106-tone RU and the 14th 26-tone RU are aggregated, and anMRU in which the 4th 106-tone RU and the 14th 26-tone RU are aggregated.13. A method in a wireless local area network (WLAN) system, the methodcomprising: generating, by a transmitting station (STA), a PhysicalProtocol Data Unit (PPDU); and transmitting, by the transmitting STA,the PPDU to a receiving STA, wherein the receiving STA is a 20 MHzoperating non-AP STA, wherein the 20 MHz operating non-AP STA does notsupport a first multiple-resource unit (MRU), wherein, based on abandwidth of the PPDU being 40 MHz, the bandwidth of the PPDU comprisesfirst to 18th 26-tone RUs, first to 8th 52-tone RUs, first to 4th106-tone RUs, or first and second 242-tone RUs, wherein the first MRUincludes an MRU in which the second 52-tone RU and the 5th 26-tone RUare aggregated, an MRU in which the 6th 52-tone RU and the 14th 26-toneRU are aggregated, an MRU in which the first 106-tone RU and 5th 26-toneRU are aggregated, an MRU in which the second 106-tone RU and the 5th26-tone RU are aggregated, an MRU in which the 3rd 106-tone RU and the14th 26-tone RU are aggregated, and an MRU in which the 4th 106-tone RUand the 14th 26-tone RU are aggregated.
 14. The method of claim 13,wherein the first to 18th 26-tone RUs are arranged by an order startingfrom a 26-tone RU having a low frequency to a 26-tone RU having a highfrequency, wherein the first to 8th 52-tone RUs are arranged by an orderstarting from a 52-tone RU having a low frequency to a 52-tone RU havinga high frequency, wherein the first to 4th 106-tone RUs are arranged byan order starting from a 106-tone RU having a low frequency to a106-tone RU having a high frequency, and wherein the first and second242-tone RUs are arranged by an order starting from a 242-tone RU havinga low frequency to a 242-tone RU having a high frequency.
 15. The methodof claim 13, wherein, based on the bandwidth of the PPDU being 80 MHzcomprising first to 36th 26-tone RUs, first to 16th 52-tone RUs, firstto 8th 106-tone RUs, or first to 4th 242-tone RUs, wherein the first MRUincludes an MRU in which the 5th 26-tone RU and the second 52-tone RUare aggregated, an MRU in which the 14th 26-tone RU and the 6th 52-toneRU are aggregated, an MRU in which the 23rd 26-tone RU and the 10th52-tone RU are aggregated, an MRU in which the 32nd 26-tone RU and the14th 52-tone RU are aggregated, an MRU in which the 5th 26-tone RU andthe first 106-tone RU are aggregated, an MRU in which the 14th 26-toneRU and the 4th 106-tone RU are aggregated, an MRU in which the 23rd26-tone RU and the 5th 106-tone RU are aggregated, and an MRU in whichthe 32nd 26-tone RU and the 8th 106-tone RU are aggregated.
 16. Themethod of claim 15, wherein the first to 36th 26-tone RUs are arrangedby an order starting from a 26-tone RU having a low frequency to a26-tone RU having a high frequency, wherein the first to 16th 52-toneRUs are arranged by an order starting from a 52-tone RU having a lowfrequency to a 52-tone RU having a high frequency, wherein the first to8th 106-tone RUs are arranged by an order starting from a 106-tone RUhaving a low frequency to a 106-tone RU having a high frequency, andwherein the first to 4th 242-tone RUs are arranged by an order startingfrom a 242-tone RU having a low frequency to a 242-tone RU having a highfrequency.
 17. The method of claim 13, wherein, based on the bandwidthof the PPDU being 160 MHz including first and second 80 MHz subchannels,wherein the first 80 MHz subchannel includes first to 36th 26-tone RUs,first to 16th 52-tone RUs, first to 8th 106-tone RUs, or first to 4th242-tone RUs, and when the second 80 MHz subchannel includes 37th to72nd 26-tone RUs, 17th to 32nd 52-tone RUs, 9th to 16th 106-tone RUs, or5th to 8th 242-tone RUs.
 18. The method of claim 17, wherein the firstMRU includes: an MRU in which the 5th 26-tone RU and the second 52-toneRU are aggregated, an MRU in which the 14th 26-tone RU and the 6th52-tone RU are aggregated, an MRU in which the 23rd 26-tone RU and the10th 52-tone RU are aggregated, an MRU in which the 32nd 26-tone RU andthe 14th 52-tone RU are aggregated, an MRU in which the 41st 26-tone RUand the 18th 52-tone RU are aggregated, an MRU in which the 50th 26-toneRU and the 22nd 52-tone RU are aggregated, an MRU in which the 59th26-tone RU and the 26th 52-tone RU are aggregated, an MRU in which the68th 26-tone RU and the 30th 52-tone RU are aggregated, an MRU in whichthe 5th 26-tone RU and the first 106-tone RU are aggregated, an MRU inwhich the 14th 26-tone RU and the 4th 106-tone RU are aggregated, an MRUin which the 23rd 26-tone RU and the 5th 106-tone RU are aggregated, andan MRU in which the 32nd 26-tone RU and the 8th 106-tone RU areaggregated, an MRU in which the 41st 26-tone RU and the 9th 106-tone RUare aggregated, an MRU in which the 50th 26-tone RU and the 12th106-tone RU are aggregated, an MRU in which the 59th 26-tone RU and the13th 106-tone RU are aggregated, and an MRU in which the 68th 26-tone RUand the 16th 106-tone RU are aggregated.
 19. A transmitting station(STA) in a wireless local area network (WLAN) system, the transmittingSTA comprising: a memory; a transceiver; and a processor beingoperatively connected to the memory and the transceiver, wherein theprocessor is configured to: generate a Physical Protocol Data Unit(PPDU); and transmit the PPDU to a receiving STA, wherein the receivingSTA is a 20 MHz operating non-AP STA, wherein the 20 MHz operatingnon-AP STA does not support a first multiple-resource unit (MRU),wherein, based on a bandwidth of the PPDU being 40 MHz, the bandwidth ofthe PPDU comprises first to 18th 26-tone RUs, first to 8th 52-tone RUs,first to 4th 106-tone RUs, or first and second 242-tone RUs, wherein thefirst MRU includes an MRU in which the second 52-tone RU and the 5th26-tone RU are aggregated, an MRU in which the 6th 52-tone RU and the14th 26-tone RU are aggregated, an MRU in which the first 106-tone RUand 5th 26-tone RU are aggregated, an MRU in which the second 106-toneRU and the 5th 26-tone RU are aggregated, an MRU in which the 3rd106-tone RU and the 14th 26-tone RU are aggregated, and an MRU in whichthe 4th 106-tone RU and the 14th 26-tone RU are aggregated.